A Stereo-Atlas of Ostracod Shells

INSTRUCTIONS TO AUTHORS

Contributions illustrated by scanning electron micrographs of Ostracoda in stereo-pairs

are invited. Full instructions may be obtained on request from the Editors. Format should

follow the style set by the majority of papers in this issue. The Editors should be

consulted for advice before figures for plates are mounted. Descriptive matter apart from

illustrations should be cut to a minimum; preferably each plate should be accompanied by

one page of text only.

Department of Geology, The University, Leicester.

Erratum: The year of issue on the spine of this part should read 1975 and not 1974.

STEREO-VIEWING FOR USERS OF THE ATLAS

In order to gain maximum information and benefit from the use of the Stereo-Atlas it is

essential that the user view the micrographs stereoscopically. Small pocket-sized stereo-

viewers are most suitable for this purpose. Two suppliers are:

C. F. Casella & Co. Ltd., Regent House, Britannia Walk, London, N1 7ND, and

Air Photo Supply Corp. , 158, South Station, Yonkers, New York 10705.

The scanning electron microscope in the Department of Geology of the University of

Leicester was supplied by the Natural Environment Research Council under the terms of

Grant No. GR/3/95 for the purpose of micropalaeontological research. Editorial expenses

are supported by N. E. R. C. Grant No. GR3/2198.

Plates printed by Broadwater Press Limited* Welwyn Garden City, Herts., England.

Stereo-Atlas of Ostracod Shells, 2:23:141-148 (1975) Cluthia keiji (1 of 8)

595.337.14 (119.9) (262.114:161.000.40): 551.35(24.08.81)

ON CLUTHIA KEIJI NEALE sp. nov.

by John W. Neale

(University of Hull 3 England)

Cluthia keiji sp. nov.

1973 Cluthia cluthae (Brady, Crosskey & Robertson, 1874); J. W. Neale, J. Paleont. , vol. 47,

no. 4, pp. 684-686 (pars), pi. 1, figs. 2-4 ( non figs. 1, 5-11).

Holotype : University of Hull coll. no. HU.130.R.1, d RV.

[Paratypes: University of Hull coll. nos. HU . 130 . R. 2-7 ,

HU . 130 . R. 8 . 1-6 , and 18 specimens T192-193 in the University of Utrecht

coll. , Holland] .

Type locality: Mediterranean off E Spain, long. 0° 38 ' 20 . 5"E , lat. 40°08'36"II. Depth

81 m. Recent.

Derivation of name: in honour of Dr. A. J. Keij who first drew ny attention to this

material .

Explanation of Plate 2:23:142

Fig. 1, 9 RV, ext. lat. (HU. 130. R. 2, 276 ym long); fig. 2, d RV, ext. lat. (HU.130.R.1,

286 ym long) .

Scale A (100 ym ; x338) , figs. 1, 2.

Stereo-Atlas of Ostracod Shells, 2:23:143 Cluthia keiji (3 of 8)

Figured specimens: University of Hull coll. nos. HU.130.R.1 (d RV: PI. 2:23:142, fig. 2;

PI. 2:23:148, fig. 2), HU. 130, R. 2 (9 RV: PI. 2:23:142, fig. 1),

HU. 130. R. 3 (9 LV: PI. 2:23:144, fig. 1; PI. 2:23:148, fig. 1), HU. 130. R. 4

(9 RV: PI. 2:23:144, fig. 2; PI. 2:23:148, fig. 3), HU. 130. R. 5 (9 LV:

PI. 2:23:146, fig. 1), HU. 130. R. 6 (9 car.: PI. 2:23:146, fig. 2).

All specimens are from the type locality.

Diagnosis: A small, non-tuberculate species of Cluthia.

Remarks: Off Spain, the commonest associates of C. keiji are Leptocythere multi-

punctata multipunctata (Seguenza) , C all istocy there sp., Cytheropteron

(C.) crass ipinnatum (Brady & Norman) sensu Puri et al . , Eucytherura

mistrettai Sissingh, Hemicytherura defiorei Ruggieri and Buntonia (B.)

sublatissimum suhlatissimum (Neviani) for which information I am

indebted to Dr. Keij. A single male left valve (0.279 mm long) has

also been found in Quaternary deposits 30 m below the sea-floor (depth

93 m) off Malta at long. 14°58'20"E, lat. 35°39'30"N. Dr. I. Yassini has

kindly sent me a S.E.M. photograph of a single left valve which he

obtained from recent sediments in Bou-Ismail Bay (W of Algiers) . The

pitting is less impressed than in the material off Spain, but its

density and pattern is very similar and there is little doubt that

Dr. Yassini' s specimen is a female of the present species.

Explanation of Plate 2:23:144

Fig. 1, 9 LV, int. lat. (HU. 130. R. 3, 273 ym long); fig. 2, 9 RV, int. lat., showing

prominent ventral "snap-knob" (HU. 130. R. 4, 299 ym long).

Scale A (100 ym ; x275) , figs. 1, 2.

Stereo-Atlas of Ostracod Shells, 2:23:144

Cluthia keiji (4 of 8)

Stereo-Atlas of Ostracod Shells, 2:23:142

Cluthia keiji (2 of 8)

.

.

m

■

Stereo-Atlas of Ostracod Shells, 2:23:145 Cluthia keiji (5 of 8)

Remarks (contd.) : These small Mediterranean specimens (0.273-0.299 mm long) show sexual

dimorphism and resolve a problem noted by Neale (op. cit. ) . Rare

specimens from off N Norway (0.331 mm long) and from the Celtic Sea

(0.299-0.305 mm long) were generally smaller than typical C. cluthae and

lacked tuberculation . They were tentatively interpreted as juveniles of

the latter species. They are now seen to belong in C. keiji which ranges

from the western Mediterranean to almost 70 °N. Over this range there is

an increase in size northwards to reach a maximum length of 0.331 mm

(adult C. cluthae commonly range in length from 0.364-0.392 mm).

Distribution: W Mediterranean and E Atlantic, Recent and Quaternary.

Explanation of Plate 2:23:146

Fig. 1, 9 LV, ext. lat. (HU. 130. R. 5, 280 ym long); fig. 2, 9 car., ext. dors. (HU. 130. R. 6,

299 ym long) .

Scale A (100 ym ; x 336 ) , figs. 1, 2.

Stereo-Atlas of Ostracod Shells, 2:23:147 Cluthia keiji (7 of 8)

Explanation of Plate 2:23:148

Fig. 1, 9 LV, int. muse. sc. (HU. 130. R. 3) ; fig. 2, d RV, ext. ant. obi. (HU. 130. R. 1) ;

fig. 3, 9 RV, int. muse. sc. (HU. 130 . R. 4) .

Scale A (25 ym ; *880) , figs. 1, 3; scale B (100 ym ; *272) , fig* 2.

Stereo-Atlas of Ostracod Shells, 2:23:146

Cluthia keiji (6 of 8)

Cluthia keiji (8 of 8)

Stereo-Atlas of Ostracod Shells, 2:23:148

Stereo-Atlas of Ostracod Shells, 2:24:149-156 (1975) Hirschmannia viridis (1 of 8)

595.337.14 (119.9) (261.268:162.003.50): 551.351

ON HIRSCHMANNIA VIRIDIS (0. F. MULLER)

by John E. Whittaker

(. British Museum (Natural History) London )

Genus HIRSCHMANNIA Elofson, 1941

Type-species (by original designation): Cythere viridis 0. F. Muller, 1785

Diagnosis: Carapace compressed in dorsal view, kidney-shaped in lateral view;

ventral margin concave in oral region. Eye-spot distinct. Hinge gongvlo-

dont , similar to Loxoconcha , but with smooth median element. Wide

anterior and posterior vestibules.

Remarks: Hirschmannia appears to be represented by only one species, the type,

H. viridis. This is clearly separated from Loxoconcha Sars, 1866, on

account of the smooth (rather than crenulate) median bar of its gongylo-

dont hinge and in the wide development of the anterior and posteroventral

vestibula. Soft-parts are also distinct (see Elofson, op. cit. , p. 333).

Loxoconcha tamarindus (Jones, 1857), included in Hirschmannia by Wagner,

1957 ( Sur les Ostracodes du Ouaternaire recent des Pays-Bas etc., Mouton

& Co., The Hague, p. 69, pi. XXX), has the soft-parts of a Loxoconcha.

Explanation of Plate 2:24:150

Fig. 1, post-maturation moult car., ext. It. lat. (1974.130; 580 ym long); fig. 2, 9 car.,

ext. It. lat. (1974.131; 480 ym long); d car., ext. It. lat. (1974.132; 460 ym long).

Scale A (100 ym ; xl20) , figs. 1-3.

Stereo-Atlas of Ostracod Shells, 2:24:151 Hirschmannia viridis (3 of 8)

Hirschmannia viridis (0. F. Muller, 1785)

1785 Cythere viridis sp. nov. 0. F. Muller, Entomostraca seu Insecta Testacea , quae in

aquis Daniae et Norvegiae reperit , descripsit et iconihus illustravit , Lipsiae et

Havniae, p. 64, pi. VII, figs. 1, 2.

1905 Cythere cyamos sp. nov. A. M. Norman, Jr. Nat., vol. 14, p. 144.

1912 Loxoconcha sarsii sp. nov. N. Hirschmann, Acta Soc. Fauna Flora fenn. , vol. 36,

no. 2, p. 22, pi. II, figs. 20-25.

1941 Hirschmannia viridis (O. F. Muller); 0. Elofson, Zool. Bidr. Upps., vol. 19,

p. 332 (q.v. for detailed synonymy) .

Type specimens : According to Elofson, (op. cit., p. 332) the collections of 0. F. Muller

in the Zoological Museum, Copenhagen, no longer exist. Type locality not

given, but probably the E coast of Denmark; associated with marine algae.

Diagnosis: Adults small. Valves finely pitted. Males more elongate and thinner.

Figured specimens: Brit. Mus. (Nat. Hist.) nos. 1974.130 (post-maturation moult, car.:

PI. 2:24:150, fig. 1), 1974.131 (9 car.: Pi, 2:24:150, fig. 2;

PI. 2:24:156, figs. 3, 4), 1974.132 (d car.: Pi. 2:24:150, fig. 3;

PI. 2:24:156, fig. 1), 1974.133 (9 car.: Pi. 2:24:152, fig. 1),

1974.134 (d car.: Pi. 2:24:152, fig. 2), 1974.135 (9 car.: Pi. 2:24:152,

fig. 3), 1974.136 (d LV: Pi. 2:24:154, fig. 1), 1974.137 (d LV:

PI. 2:24:154, fig. 2), 1974.138 (d RV: Pi. 2:24:154, figs. 3, 4),

1974.139 (9 LV: PI. 2:24:156, fig. 2).

Explanation of Plate 2:24:152

Fig. 1, 9 car., ext. dors. (1974.133; 490 ym long); fig. 2, d car., ext. dors. (1974.134;

470 ym long); fig. 3, 9 car., ext. vent. (1974.135; 500 ym long).

Scale A (100 ym ; *130) , figs. 1-3.

Stereo-Atlas of Ostracod Shells, 2:24:150

Hirschmannia viridis (2 of 8)

Stereo-Atlas of Ostracod Shells, 2:24:152

Hirschmannia viridis (4 of 8)

Stereo-Atlas of Ostracod Shells, 2:24:153 Hirschmannia viridis (5 of 8)

Figured specimens: Recent (living when collected). From a sample of the red coralline alga

(contd.) Corallina officinalis L. , taken in a rock-pool at Osmington Mills,

Weymouth Bay, S England (approx, long. 2°23'W, lat. 50°38'N); salinity

34%0/ water-temperature 5°C; coll, author, 2nd March 1969.

Remarks: The synonymy of this species, much confused in the last century, was

greatly elucidated by Elofson (op. cit., p. 332). In brief, authors were

never sure how to distinguish II. viridis from the juveniles of Cythere

lutea 0. F. Muller, 1785; they also confused it v/ith Loxoconcha

rhomboidea (Fischer, 1855) and L. elliptica Brady, 1868. Norman (op.

cit., p. 144), justifying the erection of his new name Cythere cyamos ,

writes ... "I had for some time thought that this was the young of

C. lutea ... yet it has not quite the same form. Sars [1866, Forh.

VidenskSelks . Krist., p. 30] referred this species to the Cythere viridis

of Muller, but I regard Muller's species as that which Prof. Brady used

to name Loxoconcha elliptica" . Hirschmann (op. cit., p. 22), who had

evidently not seen Norman's paper, was of a similar conviction and gave

it yet another name Loxoconcha sarsii. Today the brackish-water species

L. elliptica , and the predominantly marine phvtal species L. rhomboidea

and H. viridis are universally recognised as distinct and thus cyamos

and sarsii are rejected junior synonyms.

Explanation of Plate 2:24:154

Fig. 1, d LV, int. lat. showing soft-parts (1974.136; 480 ym long); fig. 2, d LV, int. lat.

(1974.137; 480 ym long). Figs. 3, 4, d RV, int. lat. (1974.138; 460 ym long): fig. 3, ant.

hinge; fig. 4, post, hinge.

Scale A (100 ym , xi3Q) , figs. 1, 2; scale B (25 ym , x450) , figs. 3, 4.

Stereo-Atlas of Ostracod Shells, 2:24:155 Hirschmannia viridis (7 of 8)

Remarks (contd.): From the 1,750 living adult specimens of H. viridis collected from the

Fleet and Weymouth Bay, Dorset, S England, the mean length for the

female carapace was approximately 0.48 mm and 0.47 mm for the male.

Plate 2:24:150, figs. 2, 3, show a typical female and male from a large

population in a Weymouth Bay rock-pool; PI. 2:24:150, fig. 1, however, is

of interest in that it shows an adult (of length 0.58 mm) which has

clearly entered a further growth stage. The only other example of this

rare occurrence of a post-maturation moult, in my study of some 60 livincr

species, was of a specimen of Paradoxostoma pulchellum Sars, 1866.

Distribution: Ecology: The life history and ecology of H. viridis is very well known

(see particularly Hagerman, 1969, Ophelia, vol. 7, pp. 79-99). It is a

phytal species occurring mainly in the weed-rich littoral fringes of the

coasts of NW Europe, often penetrating brackish-water, where green-algae

are present. In the Baltic Sea it can tolerate a salinity as low as

2-3 %0„ Living records suggest a geographical distribution from the Arctic

coasts of Scandinavia in the N, to SW France in the S. The species has one

population cycle per year, the adults being confined to the winter months.

Winter and Spring collections of ostracods , at least on the S coast of

England, are generally overwhelmingly dominated by H. viridis.

Stratigraphical range: Pleistocene-Recent.

Explanation of Plate 2:24:156

Fig. 1, d car, , ext. lt0 lat. (1974.132), muse. sc. pattern interfering with punctation;

fig. 2, 9 LV, int. muse. sc. (1974.139; 500 ym long); fig. 3, $ car. (1974.131), sieve

pore, post. dors, region; fig. 4, 9 car. (1974.131), ant. dors, region showing eye-spot.

Scale A (50 ym ; x400) , figs. 1, 2; scale B (10 ym ; xl800) , fig. 3; scale C (25 ym ; x700) ,

fig. 4.

■

Stereo-Atlas of Ostracod Shells, 2:25:157-164 (1975) Lophocythere ostreata (1 of 8)

595.337.14 (116.222) (423.8:162.003.51 + 423.3:162.003.50 + 425.72:162.002.51): 551.35

+ 552.523 + 552.542

ON LOPHOCYTHERE (LOPHOCYTHERE) OSTREATA (JONES AND SHERB0RN)

by Carol Mayes

(British Museum (Natural History) London )

Genus LOPHOCYTHERE Sylvester-Bradlev, 1948

Type-speoies (by original designation): Cytheridea ostreata Jones and Sherborn, 1888

Diagnosis: Rectangular, dimorphic genus of Progonocytherinae with highly

ornamented carapace. Ornamentation consisting of ridges, reticulations

and prominences. Hinge entomodont. Duplicature without a vestibule.

Muscle scars with four oval adductor scars and a circular or oval

frontal scar.

Subgenus LOPHOCYTHERE Sylvester-Bradlev, 1948

Diagnosis: Subgenus of Lophocythere with prominent L-shaped ridge extending from

the. eye tubercle and paralleling anterior and ventral margins. Area of

valve above the ridge ornamented with prominences or ribs.

Explanation of Plate 2:25:158

Fig. 1, 6 RV, ext. lat. (I 1833, 810 ym long); fig. 2, 9 LV, ext. lat. (IH 41918, 770 ym

long); fig. 3, 9 LV, ext. lat. (10 6294, 770 ym long).

Scale A (250 ym ; x74) , fig. 1; scale B (250 ym ; x78) , figs. 2, 3.

Stereo-Atlas of Ostracod Shells, 2:25:159 Lophocythere ostreata (3 of 8)

Lophocythere ostreata (Jones and Sherborn, 1888)

1888 Cytheridea ostreata sp. nov. T. R. Jones & C. D. Sherborn, Proc . Bath nat . Hist,

antiq. Fid Club, vol. 6, p. 271, pi. 4, figs. 6a-c.

1888 Cytheridea hicarinata sp. nov. T. R. Jones & C. D. Sherborn, ibid., p. 270, pi. 4,

figs. 5a-c.

1948 Lophocythere ostreata (Jones & Sherborn); P. C. Sylvester-Bradley , Geol. Mag.,

vol. 85, no. 4, p. 195, pi. 14, figs. 1-4; pi. 15, figs. 1, 2.

1963 Lophocythere ostreata (Jones & Sherborn); H. J. Oertli, Mesozoic ostracod faunas of

France, p. 42, pi. 28, fig. o; pi. 29, fig. o. Leiden.

1967 Lophocythere ostreata (Jones & Sherborn); R. H. Bate, Bull. Br . Mus . nat. Hist.

[Geol.), vol. 14, p. 51.

1969 Lophocythere ostreata (Jones & Sherborn); R. H. Bate, ibid., vol. 17, no. 8, p. 420,

pi. 12, fig. 5, text-fig. 13.

Holotype : Brit. Mus. (Hat. Hist.) I 1833, d RV.

Type locality: Yellow Fuller's Earth Clay, Midford, Bath, Somerset, England.

Diagnosis: Species of subgenus Lophocythere having three major prominences

obliquely aligned across each valve: most anterior being situated

beneath the eye node, most dorsal situated just below and in front of

the posterior cardinal angle. Shell surface reticulate, strength of

reticulations variable. Ventral keel strongly developed.

Explanation of Plate 2:25:160

Fig. 1, d RV, hinge, int. lat. (IN 41919, 730 ym long); fig. 2, 9 LV, hinge, int. lat.

(10 6297, 710 ym long); fig. 3, d RV, muse. sc. (IN 41919); fig. 4, 9 LV, int. lat. (10 6294).

Scale A (100 ym ; xi30) , fig. 1; scale B (100 ym ; xi28) , fig. 2; scale C (50 ym ; x460) ,

fig. 3; scale D (250 ym ; *78), fig. 4.

Stereo-Atlas of Ostracod Shells, 2:25:158

Lophocythere ostreata (2 of 8)

Stereo-Atlas of Ostracod Shells, 2:25:160

Lophocythere ostreata (4 of 8)

Stereo-Atlas of Ostracod Shells, 2:25:161

Lophocy there ostreata (5 of 8)

.Figured specimens: Brit. Mus. (Nat. Hist.) nos. I 1833 (d RV: Pi. 2:25:158, fig. 1),

IN 41918 (9 LV: Pi. 2:25:158, fig. 2), IN 41919 (d RV: Pi. 2:25:160,

figs. 1, 3; PI. 2:25:164, fig. 1), IN 41920 (juv. LV: PI. 2:25:164,

fig. 2), IN 41921 (juv. RV: Pi. 2:25:164, fig. 3), IN 41922 (9 car.:

PI. 2:25:162, figs. 1-3), 106294 (9 LV: PI. 2:25:158, fig. 3;

PI. 2:25:160, fig. 4), 10 6297 (9 LV: Pi. 2:25:160, fig. 2). No. I 1833

from the type locality (Upper Bathonian) ; 10 6297, IN 41918-IN 41922 fror

the Boueti Bed (Upper Bathonian) , Herbury, Dorset, England; 10 6294 from

the Bathonian of Kirtlington Quarry, Oxfordshire, England.

Remarks: The position of the three major

prominences (a-c; text-fig. 1) varies

slightly between the left and right

valves. A minor prominence (d) may be

associated with these three, situated

directly below the posterior-dorsal

prominence (c) which is occasionally

missing or reduced in size.

Text-fig. 1. Major ridge and

prominences of L. ostreata .

Explanation of Plate 2:25:162

Fig. 1, 9 car., vent. (IN 41922, 690 ym long); fig. 2, 9 car., dors. (IN 41922); fig. 3,

9 car. , ant. (IN 41922) .

Scale A (250 ym ; x89) , figs. 1, 2; scale B (250 ym ; xll4) , fig. 3.

Stereo-Atlas of Ostracod Shells, 2:25:163 Lophocy there ostreata (7 of 8)

Distribution: A marine species. Found in the Middle to Upper Bathonian of the Vienne

valley, E of Poitiers, France and Upper Bathonian of Boulogne-sur-Mer ,

France (Oertli, op. cit.); Upper Bathonian Yellow and Blue Fuller's Earth

Clays of Bath, England (type locality; Jones & Sherborn, op. cit.);

Upper Bathonian Boueti Bed, Herbury, near Langton Herring, Dorset,

England (Nat. Grid Ref.: SY 610810; Sylvester-Bradley , op. cit.); Middle

to Upper Bathonian of Kirtlington cement quarry, Kirtlington, near

Oxford, England (Nat. Grid Ref.: SP 495200; herein); Middle Bathonian

Upper Estuarine series, Kings Cliffe, Northamptonshire, England (Nat.

Grid Ref.: TL 012966; Bate, 1967); base of Fuller's Earth Rock, at top

of Fuller's Earth (Middle-Upper Bathonian) in Institute of Geological

Sciences (I. G. S.) borehole no. 15 at Swainswick, Somerset, England

(Nat. Grid Ref.: ST 75766907); Upper Fuller's Earth Clay, Upper Bathonian,

in I. G. S. borehole no. 1 at Nettleton, Wiltshire, England (Nat. Grid

Ref. : ST 82357846) .

Acknowledgement: To I. G. S. and Messrs. Lander, Raikes and Marshall for access to the

Swainswick borehole material, and to the Wessex Water Authority (and

I. G. S.) for access to the Nettleton borehole material.

Explanation of Plate 2:25:164

Fig. 1, d RV, int. lat. (IN 41919) ; fig. 2, juv. LV, ext. lat. (IN 41920, 590 ym long) ;

fig. 3, juv. RV, ext. lat. (IN 41921, 550 ym long).

Scale A (250 ym ; *82), fig. 1; scale B (250 ym ; xioi) , fig. 2; scale C (250 ym ; xilO) ,

fig. 3.

Stereo-Atlas of Ostracod Shells, 2:25:162

Lophocythere ostreata (6 of 8)

Stereo-Atlas of Ostracod Shells, 2:25:164

Lophocythere ostreata (8 of 8)

Stereo-Atlas of Ostracod Shells, 2:26:165-172 (1975) Lophocythere hradiana (1 of 8)

595.337.14 (116.222) (422.1:162.001.51 + 423.1:162.003.51): 551.35 + 552.523 + 552.544

ON LOPHOCYTHERE (NEUROCYTHERE) BRADIANA (JONES)

by Carol Mayes

(. British Museum (Natural History) 3 London )

Subgenus NEUROCYTHERE Whatley, 1970

Type-speeies (by original designation): Cythere hradiana Jones, 1884

Diagnosis: Subgenus of Lophocythere with four or more longitudinal ribs

converging towards anterior region of carapace. Minor ribs may be

present. Intercostate region may be reticulate. Eye node distinct.

Explanation of Plate 2:26:166

Fig. 1, cf car., dors. (IN 42372, 620 ym long); fig. 2, 9 RV, int. muse. sc. (SAC. 670. C. 5,

630 ym long); fig. 3, cf LV, hinge, int. lat. (SAC . 670. C . 6, 700 ym long); fig. 4, 9 RV,

hinge, int. lat. (SAC . 670.C . 7 , 660 ym long).

Scale A (250 ym ; x96) , fig. 1; scale B (50 ym ; x370) , fig. 2; scale C (250 ym ; xll7),

figs. 3, 4.

Stereo-Atlas of Ostracod Shells, 2:26:167 Lophocythere hradiana (3 of 8)

Lophocythere (Neuroey there) hradiana (Jones, 1884)

1884 Cythere hradiana sp. nov. T. R. Jones, Q. Jl geol . Soc . Lond . , p. 772, pi. 34, fig. 38

1888 Cytheridea craticula sp. nov. T. R. Jones & C. D. Sherborn, Proc . Bath nat . Hist,

antiq. Fid Club, vol. 6, p. 272, pi. 4, figs. 9a-c, lOa-c.

1948 Lophocythere hradiana (Jones); P. C. Sylvester-Bradley , Geol. Mag., vol. 85, no. 4,

p. 196, pi. 14, figs. 7-10; pi. 15, figs. 8-11.

1969 Lophocythere hradiana (Jones); R. H. Bate, Bull. Br . Mus. nat. Hist. (Geol.), vol. 17,

no. 8, p. 390, pi. 3, figs. 3, 5, 6, text-figs. 3, 4.

1969a Lophocythere hradiana (Jones); F. Depeche, Bull. Cent. Rech. Pau-SNPA, vol. 3, p. 272,

pi. 3, fig. 3.

1969b Lophocythere hradiana (Jones); F. Depeche, Revue Micropaleont . , vol. 12, no. 2, pi. 3,

fig. 8.

1970 Lophocythere (Neurocythere) hradiana (Jones); R. C. Whatley, Bull. Br . Mus. nat. Hist.

(Geol.), vol. 19, no. 6, p. 336.

Lectotype: Brit. Mus. (Nat. Hist.) IN 42372, cf carapace.

Type locality: Richmond boring (at 1205 feet). Greater London, England; Great Oolite.

Nat. Grid Ref.: approx. TQ 177747.

Explanation of Plate 2:26:168

Fig. 1, 9 car., dors. (10 3628, 570 ym long); fig. 2, 9 car., vent. (10 3629, 640 ym long);

fig. 3, cf car., vent. (10 3627, 630 ym long).

Scale A (250 ym ; xi05) , fig. 1; scale B (250 ym ; x93) , fig. 2; scale C (250 ym ; x95) ,

fig. 3.

Lophocy there bradiana (4 of 8)

Stereo-Atlas of Ostracod Shells, 2:26:168

Stereo-Atlas of Ostracod Shells, 2:26:166

Lophocythere bradiana (2 of 8)

Stereo-Atlas of Ostracod Shells, 2:26:169 Lophocythere bradiana (5 of 8)

Diagnosis: Species of Neurocythere with four major carinae converging towards the

anteroventral region and two minor carinae situated in the posterior

half of the shell. Intervening shell surface reticulate.

Figured specimens: Brit. Mus. (Nat. Hist.) nos. IN 42372 (d car.: PI. 2:26:166, fig. 1;

Pi. 2:26:172, figs. 1, 3), 10 3627 (d car.: Pi. 2:26:168, fig. 3),

10 3628 ($ car.: Pi. 2:26:168, fig. 1; Pi. 2:26:170, fig. 3), 10 3629

(9 car.: Pi. 2:26:168, fig. 2). Institute of Geological Sciences (London)

nos. SAC.670.C.1 {d LV: Pi. 2:26:172, fig. 2), SAC. 670. C. 3 (9 car.:

PI. 2:26:170, fig. 2), SAC. 670. C. 4 (9 car.: Pi. 2:26:170, fig. 1),

SAC. 670. C. 5 (9 RV: Pi. 2:26:166, fig. 2), SAC. 670. C. 6 (d LV:

Pi. 2:26:166, fig. 3), SAC. 670. C. 7 (9 RV: Pi. 2:26:166, fig. 4). Nos.

IN 42372, 10 3627-10 3629 are all from the type locality. SAC.670.C.1,

SAC . 670 .C . 3-SAC . 670 .C . 7 are all from the Upper Fuller's Earth Clay,

Upper Bathonian (at depth 20.38 m - 20.85 m) in the Institute of

Geological Sciences (I. G. S.) borehole no. 1 at Nettleton in Wiltshire,

England; Nat. Grid Ref. : ST 82357846.

Remarks: Variations occur with the minor carinae and the reticulations between

them (see PI. 2:26:170, fig. 1; Pi. 2:26:172, fig. 1).

Explanation of Plate 2:26:170

Fig. 1, 9 car., ext. rt. lat. (SAC . 670.C . 4 , 610 ym long); fig. 2, 9 car., ext. It. lat.

(SAC . 670.C . 3 , 610 ym long); fig. 3, 9 car., ant. (10 3628).

Scale A (250 ym ; x98) , figs. 1, 2; scale B (100 ym ; xl25) , fig. 3.

Stereo-Atlas of Ostracod Shells, 2:26:171 Lophocythere bradiana (7 of 8)

Distribution: A marine species. Found in the Bathonian of Lorraine, France (Depeche,

1969b) and the Callovian of Chonville no. 1 well, Lorraine, France

(Depeche, 1969a); the Upper Bathonian, Yellowand Blue Fuller's Earth

Clays of Midford, near Bath, Somerset, England (Jones & Sherborn, op.

cit.); Great Oolite, Richmond, England (type locality; Jones, op. cit.);

Boueti Bed, Great Oolite, Herbury, Dorset, England (Sylvester-Bradley ,

op. cit.); Upper Fuller's Earth Clay, Upper Bathonian, I. G. S. borehole

Nettleton, Wiltshire, England (herein).

Acknowledgement : To I. G. S, and the Wessex Water Authority for access to the Nettleton

borehole material.

Explanation of Plate 2:26:172

Fig. 1, d car., ext. rt. lat. (IN 42372); fig. 2, d LV, ext. lat. (SAC. 670.C.1, 810 ym

long); fig. 3, d car., ant. (IN 42372).

Scale A (250 ym ; x96) , fig. 1; scale B (250 ym ; x75)f fig. 2; scale C (250 ym ; xioo) ,

fig. 3.

Stereo-Atlas of Ostracod Shells, 2:26:170

Lophocy there bradiana (6 of 8)

Stereo-Atlas of Ostracod Shells, 2:27:173-180 (1975) Progonocythere stilla (1 of 8)

595.337.14 (116.222) (423.3:162.003.50 + 423.8:162.003.51): 551.35 + 552.542 + 552.523

ON PROGONOCYTHERE STILLA SYLVESTER- BRADLEY

by Carol Mayes

( British Museum (Natural History) , London')

Genus PROGONOCYTHERE Sylvester-Bradley , 1948

Type-species (by original designation): Progonocythere stilla Sylvester-Bradley, 1948

Diagnosis: Progonocytherinae with dimorphic carapace tapering to posterior end.

Shell surface smooth or weakly ornamented. Lateral border overhanging

ventral surface. Left valve larger than right. Hinge entomodont.

Duplicature of moderate width with few, straight marginal pore canals.

Four adductor muscle scars and a single oval or rounded frontal scar.

Explanation of Plate 2:27:174

Fig. 1, <5 R V, ext. lat. (IN 41908, 670 ym long); fig. 2, 9 RV, ext. lat. (10 6288, 610 ym

long) .

Scale A (250 um ; xl25) , ficr. 1; scale B (250 um ; x]_25) * fia. 2.

Stereo-Atlas of Ostracod Shells, 2:27:175 Progonocythere stilla (3 of 8)

Progonocythere stilla Sylvester-Bradley, 1948

1948 Progonocythere stilla sp. nov. P. C. Sylvester-Bradley, Geol. Mag., vol. 85, no. 4,

p. 190, pi. 12, figs. 1, 2; pi. 13, figs. 1, 2.

1956 Progonocythere stilla Sylvester-Bradley; N. Grekoff, Guide pratique pour la

determination des ostracodes post-Paleozoiques , pi. 13, figs. 325-7, Soc., ed. Tecnip.

1963 Progonocythere stilla Sylvester-Bradley; H. J. Oertli, Mesozoic ostracod faunas of

France, p. 44, pi. 28, fig. n; pi. 29, fig. n. Leiden.

1969 Progonocythere stilla Sylvester-Bradley; R. H. Bate, Bull. Br . Mus . nat. Hist.

{Geol.), vol. 17, no. 8, p. 423, pi. 13, fig. 2.

Holotype: Brit. Mus. (Nat. Hist.) IN 41908, d RV.

Type locality: Boueti Bed, Upper Bathonian; Herbury, Dorset, England. Nat. Grid Ref.:

SY 610810.

Diagnosis: Species of Progonocythere with finely punctate shell; irregularly placed,

large, circular normal pores, concentrated towards centre of valve.

Outline of shell is tear-drop shaped.

Explanation of Plate 2:27:176

Fig. 1, d LV, hinge, dors. (IN 41909, 660 ym long) ; fig. 2, d LV , hinge, int. lat.

(IN 41909); fig. 3, d LV, int. lat. (IN 41909).

Scale A (100 ym ; x210) , fig. 1; scale B (100 ym ; xi60) , fig. 2; scale C (100 ym ; *120),

fig. 3.

Stereo-Atlas of Ostracod Shells, 2:27:176

Progonocythere stilla (4 of 8)

: Stereo-Atlas of Ostracod Shells, 2:27:174

Progonocythere stilla (2 of 8)

Stereo-Atlas of Ostracod Shells, 2:27:177 Progonocythere stilla (5 of 8)

Figured specimens: Brit. Mus. (Nat. Hist.) nos. IN 41908 {d RV: PI. 2:27:174, fig. 1),

IN 41909 (rf LV: Pi. 2:27:176, figs. 1-3), 10 6287 (d LV: PI. 2:27:180,

fig. 3), 10 6288 (9 RV: Pi. 2:27:174, fig. 2), 10 6289 (d car.:

Pi. 2:27:180, fig. 1), 10 6290 (9 car.: PI. 2:27:178, figs. 1, 3),

10 6291 (9 car.: Pi. 2:27:178, fig. 2), 10 6292 (d car.: Pi. 2:27:180,

fig. 2). IN 41908, IN 41909 and 10 6287 are from the Upper Bathonian

of the type locality. 10 6288-10 6292 are from the "Bastard Earth",

approximately 1.5 m above top of commercial Fuller's Earth, Upper

Fuller's Earth Clay (Upper Bathonian), in a small quarry in Vernham

Wood, Odd Down, 3 km S of Bath, Somerset, England (Nat. Grid Ref.:

ST 733618); coll. P. C. Sylvester-Bradley 1947 (Field ref.: 47 VW7) .

Carapace 10 6291 has been lost after preparation and photography.

Remarks: In some specimens a slightly sinuous vertical sulcus is situated in the

middle of each valve (Pi. 2:27:174, fig. 2). This sulcus, very weakly

developed, has occasionally been seen in topotype material but generally

it is lacking. The species derives its name from the characteristic tear-

drop shape of the shell.

Explanation of Plate 2:27:178

Fig. 1, 9 car., dors. (10 6290, 600 ym long); fig. 2, 9 car., vent. (10 6291, 620 ym long);

fig. 3, 9 car., ant. (10 6290).

Scale A (250 ym ; xlOO) , fig. 1; scale B (250 ym ; x 96 ) , fig. 2; scale C (250 ym ; dl4) ,

fig. 3.

Stereo-Atlas of Ostracod Shells, 2:27:179 Progonocythere stilla (7 of 8)

Distribution: A marine species. Found in the Middle to

Upper Bathonian of the Vienne valley,

E of Poitiers, and the Upper Bathonian of

Boulogne -sur -Me r, France (Oertli, op.

cit.); Upper Bathonian Boueti Bed,

Herbury, near Langton Herring, Dorset,

England (type locality; Sylvester-Bradley,

op. cit.); Upper Bathonian Upper Fuller's

Earth Clay near Bath, Somerset, England

(herein); Upper Bathonian Blue Fuller's

Earth Clay, Midford, near Bath, Somerset

(Bate, op. cit. ) .

Text-fig. 1. Marginal pore canals

in P. stilla (10 6293) .

Explanation of Plate 2:27:180

Fig. 1, d car., dors. (10 6289, 650 ym long); fig. 2, d car., vent. (10 6292, 660 ym long);

fig. 3, d LV, ext. lat. (10 6287, 770 ym long).

Scale A (250 ym ; x92) , fig. 1; scale B (250 ym ; x90) , fig. 2; scale C (250 ym ; x78) ,

fig. 3.

Progonocythere stilla (6 of 8)

Stereo-Atlas of Ostracod Shells, 2:27:180

Stereo-Atlas of Ostracod Shells, 2:27:178

Progonocythere stilla (8 of 8)

Stereo-Atlas of Ostracod Shells, 2:28:181-190 (1975) Argenticytheretta patagoniensis

595.337.14 (118.14/118.15) (83:164.072.53 + 83:164.073.52): 551.351 + 552.522 (1 of 10)

ON ARGENTICYTHERETTA (ARGENTICYTHERETTA) PATAGONIENSIS ROSE sp. nov.

by John F. Rose

(University of Hull s England)

Argenticytheretta (Argenticytheretta) patagoniensis sp. nov.

Holotype : University of Hull coll. no. HU.220.T.12, 6 R V.

Type locality: Pozo El Salto no. 1 between 1200-1203 m depth, N of Seno Skyring

(Skyring Sound), Magallanes Province, Chile; approx, long. 71°43'W,

lat. 52°31*S. Fine glauconitic shale with abundant microfauna

suggesting cool shelf seas; Oligocene (Rosarian) .

Derivation of name: From Patagonia, Chile.

Figured specimens: University of Hull coll. nos. HU. 220. T. 14.1 (9 LV: Pi. 2:28:182, fig. 1;

PI. 2:28:184, fig. 3), HU . 220. T. 14 . 2 ($ RV: Pi. 2:28:182, fig. 2),

HU. 220. T. 14. 3 (9 RV: Pi. 2:28:184, fig. 1), HU . 220 .T . 14 . 4 (tf RV:

PI. 2:28:184, figs. 2, 4), HU. 220. T. 13. 1 (9 RV: Pi. 2:28:186, fig. 1),

HU. 220. T. 12 (cf RV: Pi. 2:28:188, fig. 1), HU. 220. T. 13 . 2 (d RV:

PI. 2:28:188, fig. 2), HU. 220. T . 13 . 3 (d RV: PI. 2:28:188, fig. 3),

HU. 220. T. 15.1 (9 LV: Pi. 2:28:186, fig. 2), HU. 220. T. 15 . 2 (9 RV:

PI. 2:28:186, fig. 3).

Explanation of Plate 2:28:182

Fig. 1, 9 LV (morphotype B) , ext. lat. (HU. 220. T . 14 . 1 , 870 ym long); fig. 2, 9 RV

(morphotype B) , ext. lat. (HU . 220.T . 14 . 2 , 940 ym long).

Scale A (250 ym ; xgi) , fig. l; scale B (250 ym ; *94) , ficr. 2.

Stereo-Atlas of Osrracod Shells, 2:28:183 Argenticytheretta patagoniensis (3 of 10)

Figured specimens: The specimens were obtained from several wells drilled in a small

(contd. ) area in the N of Peninsula Brunswick and around the eastern end of

Seno Skyring, Magallanes Province, Chile. HU. 220. T. 14 . 1 from Pozo

San Antonio no. 1 (approx, long. 71°31'W, lat. 52°19'S), between

2935-2938 m; Middle Eocene (Brunswickian) . HU . 220. T . 14 . 2 from Pozo

Tranquilo no. 1 (approx, long. 72°08'W, lat. 51°57,S), between 1454

-1457 m; Lower Eocene (Manzanian) . HU . 220.T . 15 . 1 from Pozo Laguna

Blanca no. 1 (approx, long. 71°07'W, lat. 52°16'S), between 1614

-1616 m; Upper Oligocene (Miradorian) . HU. 220. T. 13 . 2 from Pozo Mina

Rica no. 1 (approx, long. 71°08!W, 52°02'S), between 65-71 m; Upper

Eocene (Clarencian) . HU. 220. T. 12 from type locality and horizon.

Specimens HU. 220. T. 14 . 3 , HU. 220. T . 14 . 4 , HU. 220. T. 13 . 1 , HU. 220. T . 15 . 2

and HU. 220 ,T . 13 . 3 from Pozo El Salto no. 1 (see type locality),

Oligocene (Cameronian) ; HU. 220. T. 14 . 3 from between 1431-1434 m,

HU. 220. T. 13 . 3 from between 1461-1464 m, HU . 220.T . 13 . 1 from between

1595-1596 m, HU. 220. T. 14 .4 and HU . 220 .T . 15 . 2 both from 1623-1626 m.

Explanation of Plate 2:28:184

Fig. 1, 9 RV (morphotype A), int. lat. (HU. 220. T . 14 . 3 , 900 ym long); fig. 2, 9 RV (morpho-

type A), int. muse. sc. (HU. 220. T. 14.4) ; fig. 3, 9 LV (morphotype B) , ext. dors.

(HU. 220. T . 14 . 1) ; fig. 4, 9 RV (morphotype A), int. hinge (HU. 220. T . 14 . 4 , 950 ym long).

Scale A (250 ym ; *80) , fig. 1? scale B (40 ym ; >085) , fig. 2; scale C (250 ym ; *87) , fig.

3; scale D (250 ym ; xi20) , fig. 4.

Stereo-Atlas of Ostracod Shells, 2:28:182 Argenticytheretta patagoniensis (2 of 10)

Stereo-Atlas of Ostracod Shells, 2:28:185

Argenticytheretta patagoniensis (5 of 10)

Diagnosis: Ornament very variable. Pits usually arranged in double rows each of

which may be separated by ribs of varying strength. Pitting becomes

coarser towards the central part of the valve where pits often

coalesce, especially in the more heavily ornamented forms. Marginal

pore canals numerous and slightly curved; a small vestibule mav be

developed. The species has been subdivided into four morphotypes : -

Morphotype A: The most common variant, this shows fairly coarse

pitting and strong ribbing over most of the valve (see Pi. 2:28:188,

fig. 1) .

Morphotype B: Pitting fairly coarse, but ribs not well developed

except in the ventral portion of the valves (see Pi. 2:28:182, figs.

1, 2).

Morphotype C: Pitting quite fine but ribs strongly developed (see

PI. 2:28:188, fig. 2).

Morphotype D: Ribs very strong and may fuse. Pits tend to be

rather irregular in size and shape (see Pi. 2:28:188, fig. 3).

Sexual dimorphism similar in all morphotypes; males are longer and

thinner.

Explanation of Plate 2:28:186

Fig. 1, 9 RV (morphotype B) , ext. lat. (HU. 220. T. 13 . 1 , 780 pm long); fig. 2, 9 LV

(morphotype A), post, snap-knob (HU. 220. T. 15. 1, 900 pm long) ; fig. 3, 9 RV (damaged by

gastropod predation; morphotype uncertain), post, snap-knob (HU. 220. T . 15 . 2 , 900 pm long).

Scale A (250 pm ; x78) , fig. 1; scale B (50 ym ; x250) , fig. 2; scale C (50 pm ; x250) ,

ficr. 3.

Stereo-Atlas of Ostracod Shells, 2:28:187 Argenticytheretta patagoniensis (7 of 10)

Remarks: There are no obvious environmental factors that might explain the

apparently random changes that occur throughout the range of the

species (Palaeocene to Oligocene; see text-fig. 2). They cannot be

linked to substrate type, age or geographic location in any way. It

seems that like many other members of the Cytherettinae , this is a

highly variable species.

This species is placed in Argenticytheretta Rossi de Garcia, 1969,

although A. patagoniensis has an ocular structure, a feature not

mentioned in the original generic description. However, from Rossi

de Garcia's drawings it appears that an eye is probably present in

the type species A. miocenica . The regular inner margin, and overall

shape of the valves in the present species agree well with

Argenticytheretta .

A. patagoniensis exhibits an unusual feature in that it has a

posterior "snap-knob." A marked socket is present in the right valve,

and a weakly developed knob in the form of an angular projection at

the point of maximum length is seen in the left valve. This feature is

seen in several other species of Argenticytheretta including

A. riescoensis sp. nov. (see Stereo-Atlas of Ostracod Shells, vol. 2,

pt. 3, pp. 195-198, 1975), and A., gonzalezi (see Stereo-Atlas of

Ostracod Shells, vol. 2, pt. 3, pp. 191-194, 1975).

Explanation of Plate 2:28:188

Fig. 1, d RV (morphotype A), ext. lat. (HU. 220. T . 12 , 980 ym long); fig. 2, d RV (morphotype

C) , ext. lat. (HU. 220. T. 13. 2, 950 ym long); fig. 3, d RV (morphotype D) , ext. lat.

(HU. 220. T. 13. 3, 950 ym long).

Scale A (250 ym ; x64) , fig. 1; scale B (250 ym ; x65) , figs. 2, 3.

Stereo-Atlas of Ostracod Shells, 2:28:188

Argenticytheretta patagoniensis (8 of 10)

Stereo-Atlas of Ostracod Shells, 2:28:186

Argenticytheretta patagoniensis (6 of 10)

Stereo-Atlas of Ostracod Shells, 2:28:189 Argenticytheretta patagoniensis (9 of 10)

Remarks (ccntd. ) : South America is the home of a group of cytherettid taxa including

Argenticytheretta (Argenticytheretta) , Argenticytheretta (Magallanella)

subgen. nov. (see Stereo-Atlas of Ostracod Shells, vol . 2, pt. 3,

pp. 203-206, 1975) and Argenticytheretta (Chilea) subgen. nov. (see

Stereo-Atlas of Ostracod Shells , vol. 2, pt. 3, pp. 207-210, 1975)

which are distinctive in possessing a regular inner margin and an

ocular structure. Undescribed buntoniids from southern Chile also

exhibit these features.

Cytheretta knysnaensis Benson, 1964 also has a similar inner margin,

and the author implies the presence of an eye. This suggests . that

cytherettid forms of this type are perhaps more widespread in the

Southern Hemisphere.

Distribution: The species is not widespread and is found only in

northern Peninsula Brunswick, eastern Isla Riesco

and just N and E of Seno Skyring, Chile.

A. patagoniensis makes up about 10% of the ostracod

fauna throughout the Eocene, but in the Oligocene

becomes very common and may make up to 40% of

individual ostracod populations.

Text-fig. 1. Marginal pore canals (HU. 220. T. 14. 3) .

Stereo-Atlas of Ostracod Shells, 2:28:190 Argenticytheretta patagoniensis (10 of 10)

Stereo-Atlas of Ostracod Shells, 2:29:191-194 (1975)

595.337.14 (118.15) (83:164.072.53): 551.351 + 552.522

Argent leather etta gonzalezi (1 of 4)

ON ARGENTICYTHERETTA (ARGENTICYTHERETTA) GONZALEZI ROSE sp. nov.

by John F. Rose

(University of Hull, England)

Argentioytheretta (Argenticytheretta) gonzalezi sp. nov.

University of Hull coll. no. HU. 220. T. 5, 9 LV.

Pozo Ponsonby no. 7E between 222-227 m depth, near the eastern limit of

Isla Riesco, Magallanes Province, Chile; approx, long. 71°49'W, lat.

52°40'S. Grey shale of Lower Oligocene age (Cameronian) with an

abundant fauna including ostracods, foraminifera and molluscs

suggesting shelf conditions.

In honour of Sr. Eduardo Gonzalez, of Empresa Nacional del Petroleo,

Magallanes, in gratitude for his great help during my visit to Chile.

University of Hull coll. nos. HU. 220. T. 6.1 (cf RV: Pi. 2:29:192, fig. 1) ,

HU. 220. T. 5 (9 LV: Pi. 2:29:192, fig. 2), HU.220.T.6.2 (UR V:

PI. 2:29:194, fig. 1), HU.220.T.6.3 (cf LV: Pi. 2:29:194, fig. 2),

HU.220.T.6.4 (9 car.: Pi. 2:29:194, fig. 3). All specimens are from the

type locality.

Explanation of Plate 2:29:192

Fig. 1, d RV, ext. lat. (HU. 220 . T . 6 . 1 , 950 ym long); fig. 2, 9 LV, ext. lat. (HU. 220. T. 5,

950 ym long) .

Scale A (250 ym ; x93), fig. 1; scale B (250 ym ; xgo) . ficr. 2.

Holotype :

Type locality:

Derivation of narne:

Figured specimens:

Stereo-Atlas of Ostracod Shells, 2:29:193

Argenticytheretta gonzalezi (3 of 4)

Diagnosis: Large, with many small pits of variable size, becoming larger in the

central portion of the valves. Three or four fine ribs are present

ventrally, running parallel to the ventral margin. The carapace is

strongly inflated posteriorly. The left valve has a pronounced angular

hinge ear. Marginal pore canals are numerous, long and simple; a small

anterior vestibule is present.

Remarks:

Distribution :

This species differs from A. patagoniensis sp. nov.

(see Stereo-Atlas of Ostracod Shells, vol. 2, pt. 3,

pp. 181-190, 1975) in the large number of pits, the

strong posterior inflation and the shape of the

hinge ear on the left valve. Unlike A. patagoniensis

it has only a short range, being restricted to the

Oligocene. Dimorphism is very marked, males are

longer than females.

Known only from well samples N of Peninsula

Brunswick and around Seno Skyring, Chile.

Text-fig. 1. Marginal pore canals (HU. 220. T. 5)

Explanation of Plate 2:29:194

Fig. 1, d RV, int. lat. (HU. 220 . T. 6 . 2 , 1000 ym long); fig. 2, d LV, int. muse. sc.

(HU . 220. T. 6 . 3) ; fig. 3, 9 car., ext. dors. (HU. 220 .T. 6 . 4 , 980 ym long).

Scale A (250 ym ; *15), fig. 1; scale B (40 ym ; x400) , fig. 2; scale C (250 ym ; x70) ,

fig. 3.

Stereo-Atlas of Ostracod Shells, 2:29:194

Argent icy theretta gonzalezi (4 of 4)

Stereo-Atlas of Ostracod Shells, 2:29:192

Argent icytheretta gonzalezi (2 of 4) j

Stereo-Atlas of Ostracod Shells, 2:30:195-198 (1975) Argenticytheretta riescoensis (1 of 4)

595.337.14 (118.14) (83:164.072.53): 551.351 + 552.522

ON ARGENTICYTHERETTA (ARGENTICYTHERETTA) RIESCOENSIS ROSE sp. nov.

by John F. Rose

(University of Hull, England)

Argenticytheretta (Argenticytheretta) riescoensis sp. nov.

Holotype: University of Hull coll. no. HU. 220. T. 4, 9 carapace.

Type locality: Pozo R.l at 24 m depth, N coast of Isla Riesco, Magallanes Province,

Chile; approx, long. 71°50'W, lat. 52°50'S. Grey shale with abundant

foraminiferal fauna. The sample comes from near the base of the Tres

Brazos Formation; Middle Eocene age (Clarencian) . Probably from shelf

sea environment.

Derivation of name: From isla Riesco, Chile.

Figured specimens: University of Hull. coll. nos. HU. 220. T. 7 (8 RV: Pi. 2:30:196, fig. 1;

PI. 2:30:198, figs. 1-4), HU. 220. T. 4 (9 car.: Pi. 2:30:196, fig. 2).

Specimen HU. 220. T. 7 from Pozo R.l (see type locality), between 289

-295 m. HU. 220. T. 4 from Pozo R.l at 24 m.

Explanation of Plate 2:30:196

Fig. 1, d RV, ext. lat. (HU. 220. T. 7, 810 ym long); fig. 2, 9 car., ext. It. lat.

(HU. 220. T. 4, 870 ym long).

Scale A (200 ym ; xll2) , fig. 1; scale B (200 ym ; *92) , fig. 2.

Stereo-Atlas of Ostracod Shells, 2:30:197 Argenticytheretta riescoensis (3 of 4)

Diagnosis: Valve with numerous small pits arranged in double rows between fine

but strongly raised ribs, which become flexuous in the centrodorsal

area. Long, simple anterior marginal pore canals and a small anterior

vestibule are present.

Remarks: A. riescoensis differs from A. patagoniensis sp. nov. and A. gonzalezi

sp. nov. (see Stereo-Atlas of Ostracod Shells, vol. 2, pt. 3, pp. 181-

190, 191-194, 1975) in its stronger ornament, and in being less

inflated. Sexual dimorphism is fairly strong, males are longer and

thinner than females.

Distribution: A. riescoensis has so far only been

found at seven different horizons

in Pozo R.l, and ranges in age from

Middle to Upper Eocene (Brunswickian

to Clarencian) .

Text-fig. 1. Marginal pore canals (HU. 220. T. 7) .

Explanation of Plate 2:30:198

Figs. 1-4, d RV (HU. 220. T. 7) : fig. 1, int. lat.; fig. 2, ext. dors.; fig. 3, int. lat.,

hinge; fig. 4, int. muse. sc.

Scale A (200 ym ; *93), fig. 1; scale B (250 ym ; *86) , fig. 2 ; scale C (200 ym ; x125) ,

fig. 3; scale D (40 ym ; *370), fig. 4.

Stereo-Atlas of Ostracod Shells, 2:30:196

Argent icg theretta riescoensis (2 of 4)

Stereo-Atlas of Ostracod Shells, 2:30:198

Argent icgtheretta riescoensis (4 of 4)

Stereo-Atlas of Ostracod Shells, 2:31:199-202 (1975) Argenticytheretta fuegoensis (1 of 4)

595.337.14 (118.21) (83:164.069.54 + 83:164.070.53): 551.351 + 552.522

ON ARGENTICYTHERETTA (ARGENTICYTHERETTA) FUEGOENSIS ROSE sp. nov.

by John F. Rose

(University of Hull t England)

Argentioytheretta (Argenticytheretta) fuegoensis sp. nov.

Holotype: University of Hull coll. no. HU. 220. T. 8, d LV.

Type locality: Cliff section at Brush Lake, Isla Grande, Tierra del Fuego; approx.

long. 68°51'W, lat. 53°13’S. Sample TdF.33; olive coloured silty shale.

Brush Lake Formation, Lower Miocene (Gaviotian) . Abundant ostracod fauna

dominated by Copytus , that suggests cool, rather shallow conditions.

-Derivation of name: From Tierra del Fuego, Chile.

Figured specimens: University of Hull coll. nos. HU. 220. T. 8 (d LV: PI. 2:31:200, fig. 1),

HU. 220. T. 11 (9 LV: Pi. 2:31:200, fig. 2), HU. 220. T. 10. 2 (9 RV:

PI. 2:31:200, fig. 3), HU. 220. T. 10.3 (9 LV: Pi. 2:31:202, figs. 1, 4),

HU. 220. T. 9 (9 LV: PI. 2:31:202, fig. 2), HU. 220. T . 11 . 2 (cf RV:

PI. 2:31:202, fig. 3).

Explanation of Plate 2:31:200

Fig. 1, cf LV (morphotype A), ext. lat. (HU. 220. T. 8, 870 ym long); fig. 2, 9 LV (morphotype

B) , int. muse. sc. (HU. 220. T . 11) ; fig. 3, 9 RV (morphotype A), ext. lat. (HU. 220. T. 10. 2 ,

850 ym long) .

Scale A (250 ym

fig. 3.

x84) , fig. 1; scale B (40 ym ; *450) , fig. 2; scale C (250 ym ; x86) ,

Stereo-Atlas of Ostracod Shells, 2:31:201 Argenticytheretta fuegoensis (3 of 4)

Figured specimens: Specimens from Lower Miocene (Gaviotian & Miradorian) , northern Tierra

(ccntd. ) del Fuego. HU. 220. T. 8 from type locality. HU. 220. T. 11 & HU. 220. T. 11 . 2

from Pozo Rio del Oro no. 1 (approx, long. 69°49'W, lat. 52°52'S),

between 571-574 m. HU. 220. T . 10 . 2 & HU. 220. T . 10. 3 from Pozo San Sebastian

no. 1 (approx, long. 68°49'W, lat. 53°16'S); HU. 220 .T . 10. 2 between 406-

409 m, HU . 220. T. 10. 3 between 610-619 m. HU. 220. T. 9 from Pozo Sombrero

no. 1 (approx. 69°11'W, lat. 52°46'S), between 808-812 m.

Diagnosis: Valves smooth or very finely punctate; punctation stronger posteriorly.

Marginal zone rather narrow; no vestibule. Marginal pore

canals fairly numerous, straight, simple. Morphotype A: with

fine punctation (Pi. 2:31:200, figs. 1, 3). Morphotype B:

completely smooth (PI. 2:31:202, fig. 2).

Remarks: Marginal zone narrower than in A. patagoniensis sp. nov.,

A. gonzalezi sp. nov., and A. riescoensis sp. nov. (see

Stereo-Atlas of Ostracod Shells , vol. 2, pt. 3, pp. 181-

190, 191-194, 195-198, 1975), and marginal pore canals

less numerous. Dimorphism: males longer than females.

Distribution: Morphotypes synchronous, but allo-

patric. Miocene; Tierra del Fuego.

Text-fig. 1. Marginal

pore canals (HU. 220. T . 10. 3 )

Explanation of Plate 2:31:202

Fig. 1, 9 LV (morphotype A), int. lat. (HU. 220.T . 10. 3 , 900 ym long); fig. 2, 9 LV

(morphotype B) , ext. lat. (HU. 220. T. 9, 870 ym long); fig. 3, 9 RV (morphotype B) , ext.

dors. (HU. 220. T . 11 . 2 , 840 ym long); fig. 4, 9 LV (morphotype A), int. hinge (HU. 220. T . 10. 3 )

Scale A (250 ym ; x70) , fig. 1; scale B (250 ym

fig. 3; scale D (200 ym ; xlOO) , fig. 4.

x78) , fig. 2; scale C (250 ym ; x71) ,

Stereo-Atlas of Ostracod Shells, 2:31:200

Argenticytheretta fuegoensis (2 of 4)

Stereo-Atlas of Ostracod Shells, 2:31:202

Argenticgtheretta fuegoensis (4 of 4)

Stereo-Atlas of Ostracod Shells, 2:32:203-206 (1975) Argenticytheretta chileana (1 of 4)

595.337.14 (118.15 + 118.21) (83:164.070.53 + 83:164.070.54 + 83:164.069.53): 551.351

+ 552.522

ON ARGENTICYTHERETTA (MAGALLANELLA) CHILEANA ROSE subgen. et sp. nov.

by John F. Rose

(Uni-vevs-ity of Hull 3 England)

Sub genus MAGALLANELLA sub gen. nov.

Type-species: Argenticytheretta (Magallanella) chileana sp. nov.

Derivation of name: From Magallanes Province, Chile.

Diagnosis: Very short; 99 almost circular. Moderately inflated, maximum width just

behind mid-point. Weak eye spot. Marginal canals fairly numerous, long,

simple. Asymmetric V-shaped frontal scar; 4 adductors, lower 2 fused.

Remarks: A. (Magallanella) differs from A. (Argenticytheretta) Rossi de Garcia,

1969 in its more rounded overall shape, its wider marginal zone, and

its more asymmetric frontal scar. It differs from A. (Chilea) subgen.

nov. (see Stereo-Atlas of Ostracod Shells, vol. 2, pt. 3, pp. 207-210,

1975) in lacking posteroventral rib, in position of maximum inflation

(further forward) , in details of hinge (more delicate and with denticles

of posteromedian swelling less marked) , and with rather fewer marginal

pore canals. Dimorphism strong; males longer and thinner.

Explanation of Plate 2:32:204

Fig. 1, d car., ext. It. lat. (HU. 220. T. 3 .1, 840 ym long); fig. 2, 9 RV, int. muse. sc.

(HU. 220. T. 3 . 2) ; fig. 3, 9 RV, ext. lat. (HU. 220. T. 3 . 2 , 750 ym long).

Scale A (250 ym ; *81) , fig. 1; scale B (100 ym ; *515) , fig. 2; scale C (250 ym ; x88) ,

fig. 3.

Stereo-Atlas of Ostracod Shells, 2:32:205 Argenticytheretta chileana (3 of 4)

Holotype: University of Hull coll. no. HU. 220. T. 2, 9 carapace.

Type locality: Pozo Posesion no. 1 between 858-863 m depth, Magallanes Province,

Chile; approx, long. 68°58'W, lat. 52°16'S. Thin grey shale band

within dominantly sandy sequence with microfauna typifying cool

shelf seas; Areniscas Arcillocas, Lower Miocene (Miradorian) .

Derivation of name: From southern Chile.

Figured specimens: University of Hull coll. nos. HU. 220. T. 3.1 (d car.: Pi. 2:32:204, fig.

1; PI. 2:32:206, fig. 2), HU. 220. T. 3. 2 (9 RV: Pi. 2:32:204, figs. 2, 3;

PI. 2:32:206, figs. 1, 3), HU. 220. T. 2 (9 car.: Pi. 2:32:206, fig. 4).

HU. 220. T. 2 from type locality. HU. 220. T. 3.1 from Pozo Manantialles

no. 9 (approx, long. 69°26'W, lat. 52°35'S), 780-804 m;

Discordia Shale, Upper Oligocene (Rosarian) .

HU. 220. T. 3. 2 from sample F.239, N coast of Bahia Inutil

(approx, long. 69°49'W, lat. 53°22'S), Tierra del Fuego;

Santa Clara Formation, Upper Oligocene (Miradorian).

Diagnosis: 4 or 5 weak ribs, each separated by 2

rows of small pits, traverse centre.

Remarks: a second Magallanella species exists in

the lower Oligocene of southern Chile.

Text-fig. 1.

Marginal pore

canals (HU. 220. T. 3. 2)

Explanation of Plate 2:32:206

Fig. 1, 9 RV, int. lat. (HU. 220. T. 3 . 2) ; fig. 2, d car., ant. vent. obi. (HU. 220. T. 3 .1) ;

fig. 3, 9 RV, int. lat., hinge (HU . 220 .T. 3 . 2 ) ; fig. 4, 9 car., ext. dors. (HU. 220.T . 2) .

Scale A (250 ym ; x91) , fig. 1; scale B (250 ym ; *71), fig. 2; scale C (100 ym ; x147) ,

fig. 3; scale D (250 ym ; *84) , fig. 4.

Argenticytheretta chileana (4 of 4)

Stereo-Atlas of Ostracod Shells, 2:32:204

Argenticytheretta chileana (2 of 4)

Stereo-Atlas of Ostracod Shells, 2:32:206

Stereo-Atlas of Ostracod Shells, 2:33:207-210 (1975) Argenticytheretta brunswickensis

595.337.14 (118.14) (83:164.071.54 + 83.164.072.54): 551.351 + 552.522 (1 of 4)

ON ARGENT ICYTHERETT. A (CHILE A) BRUNSWICKENSIS ROSE subgen. et sp. nov.

by John F. Rose

(University of Hull3 England)

Sub genus CHILE A sub gen. nov.

Type-species: Argenticytheretta (Chilea) brunswickensis sp. nov.

Derivation of name: From southern Chile.

Diagnosis: Of cytherettid shape, with weak eye tubercle. A strong posteroventral

rib is developed at the point of maximum inflation. The marginal zone

is fairly wide with a regular inner margin. Marginal pore canals are

straight and simple, and a small vestibule is developed.

Remarks: Dimorphism: males slightly longer and thinner. A. (Chilea) differs from

A. (Argenticytheretta) Rossi de Garcia, 1969, and A. ( Magallanella )

subgen. nov. (see Stereo-Atlas of Ostracod Shells, vol. 2, pt. 3, pp.

203-206, 1975) by the presence of the strong posteroventral inflation

and its associated rib, and by its more delicate hinge, in which the

postero-median element bears 5-6 sharply defined denticles.

Explanation of Plate 2:33:208

Fig. 1, $ LV, ext. lat. (HU.220.T.1, 610 ym long); fig. 2, $ LV, ant. vent. obi.

(HU.220.T.1) ; fig. 3, $ car., ext. rt. lat. (ENAP specimen, 610 ym long).

Scale A (250 ym ; xl00) , fig. 1; scale B (250 ym ; xllO), fig. 2; scale C (250 ym ; x106) ,

fig. 3.

Srereo-Atlas of Ostracod Shells, 2:33:209 Argenticytheretta brunswickensis (3 of 4)

Argenticytheretta (Chilea) brunswickensis sp. nov.

Holotype : University of Hull, coll. no. HU.220.T.1, 9 LV.

Type locality: Pozo Tres Brazos no. 1 between 1290-1293 m depth. Peninsula Brunswick,

Magallanes Province, Chile; approx, long. 70°75'W, lat. 53°14'S. Agua

Fresca Shale, Lower Eocene (Manzanian) . Fine grey shale with abundant

foraminiferal fauna suggesting cool water outer shelf conditions.

Derivation of name: From Peninsula Brunswick, Magallanes Province, Chile.

Figured specimens: University of Hull coll. no. HU.220.T.1 (9 LV: Pi. 2:33:208, figs. 1, 2;

Pi. 2:33:210, figs. 1-4); one specimen lodged with Empresa Nacional del

Petroleo (ENAP) Magallanes, Punta Arenas, Chile (9 car.: Pi. 2:33:208,

fig. 3). HU.220.T.1 from type locality. ENAP specimen from sample JSB

82, Tres Brazos Valley (approx, long. 71°4'W, lat. 53°16'S)

Tres Brazos Formation, Upper Eocene (Clarencian) .

Diagnosis: Marked flexuous central rib present, and outlined by a row

of pits which become stronger posteriorly.

Distribution: So far found at five localities in Peninsula Brunswick,

Chile; Lower to Upper Eocene (Manzanian to Moritz ian ) .

Text-fig. 1. Marginal pore canals (HU.220.T.1) . *

Explanation of Plate 2:33:210

Figs. 1-4, 9 LV (HU. 220. T. 1) : fig. 1, int. lat.; fig. 2, ext. dors.; fig. 3, int. lat.,

hinge; fig. 4, int. muse. sc.

Scale A (250 ym ; xl00) , fig. 1; scale B (250 ym ; *100) , fig. 2; scale C (100 ym ; xl80) ,

fig. 3; scale D (25 ym ; x800) , fig. 4.

/

Hornibrookella anna (1 of 4)

Stereo-Atlas of Ostracod Shells, 2:34:211-214 (1975)

595.337.14 (118.15) (430.1:161.008.52): 551.351

ON HORNIBROOKELLA ANNA (LIENENKLAUS)

by Ali A. F. Al-Furaih

(University of Leicester 3 England)

Genus HORNIBROOKELLA Moos, 1965

Type-species (by original designation): Cythere anna Lienenklaus, 1894

Remarks: Moos (1965) used the adductor muscle scar pattern as a diagnostic feature

for Hornibrookella but the present study reveals that this pattern is

variable. Not only do specimens vary one from the other (see PI. 2:34:214,

fig. 3 and text-fig. 1) , but even in one specimen the upper of the four

adductor scars may be divided in one valve and undivided in the other.

Hornibrookella anna (Lienenklaus, 1894)

1894 Cythere anna sp. nov. E. Lienenklaus, Z. dt. geol. Ges., vol. 46, no. 1, p. 209,

pi. 14, figs. lOa-c.

non 1901 Cythere anna Lienenklaus; J. G. Egger, Abh. bayr. Akad . Wiss., vol. 21, p.439,

pi. 6, figs. 27, 28.

1965 Quadracythere (Hornibrookella) anna (Lienenklaus); B. Moos, Geol. Jber., vol. 82,

p. 596, pi. 34, figs. 1-4.

Explanation of Plate 2:34:212

Fig. 1, RV ext. lat. (10 5240, 690 ym long); fig. 2, LV ext. lat. (10 5241, 646 ym long).

Scale A (250 ym ; xi30) , fig. 1; scale B (250 ym ; xl38) , fig. 2.

Stereo-Atlas of Ostracod Shells, 2:34:213 Hornibrookella anna (3 of 4)

Neotype :

Type locality:

Figured specimens:

Diagnosis:

Distribution :

Acknowledgement :

Explanation of Plate 2:34:214

Fig. 1, LV int. lat. (10 5241); fig. 2, RV int. lat. (10 5242, 658 ym long); fig. 3, LV

int. muse. sc. (10 5241) .

Scale A (250 ym ; xioi) , fig. 1; scale B (250 ym ; xg7) , fig. 2; scale C (100 ym ; x303) ,

fig. 3.

A left valve, no. TK-Nr. 5550 proposed by Moos (op. cit. ) . Collections

of Niedersachsisches Landesamt fur Bodenforschung , Hannover, W Germany.

Brandhorst near Bunde, Germany; approx, long. 8°35'E, lat. 52°12'N.

Brit. Mus. (Nat. Hist.) nos. 10 5240 (RV: Pi. 2:34:212, fig. 1),

10 5241 (LV: Pi. 2:34:212, fig. 2; Pi. 2:34:214, figs. 1, 3), 10 5242

(RV: Pi. 2:34:214, fig. 2). All from the type locality; sample no. 40671,

collection of Niedersachsisches Landesamt fur Bodenforschung, Hannover.

Longish rectangular, faintly archei

outline. Surface reticulate with

subordinate ribbing. Posterodorsal

corner with short downward curving

projection.

Known so far only from the Lower

Oligocene of W Germany.

The author wishes to express his

gratitude to Dr. B. Moos for

providing material and making

valuable suggestions.

—¥ <

la Left valve lb Right valve

Text-fig. 1. Muscle scar pattern in

two separate specimens of H. anna.

Stereo-Atlas of Ostracod Shells, 2:34:212

Hornibrookella anna (2 of 4)

Stereo-Atlas of Ostracod Shells, 2:34:214

Hornibrookella anna (4 of 4)

f

(

Stereo-Atlas of Ostracod Shells, 2:35:215-222 (1975)

595.336.14 (113.52) (45:161.013.46): 551.35 + 552.541

Kellettina carnica (1 of 8)

ON KELLETTINA CARNICA RUGGIERI AND SIVETER sp. nov.

by Giuliano Ruggieri and David J. Siveter

(University of Palermo Italy and University of Leicester 3 England)

Kellettina carnica sp. nov.

Holotype : Brit. Mus. (Nat. Hist.) 10 6301, RV.

Type locality: About 150 m E of the trigonometrical point at the top of Mount

Auernig, in the Carnic Alps, N Italy; approx, long. 13°17'E, lat.

46°33'N. Black limestones with silicified fossils; uppermost Carbon-

iferous (Donetzian) . Horizon the same as that indicated in Gever

(1897, Jb. geol. Bundesanst. , Wien, vol. 46 [for 1896], no. 1. p. 161,

fig. 3) as bed no. 20.

Derivation of name: From Carnic Alps, the region of type locality, northern Italy.

Figured specimens: Brit. Mus. (Nat. Hist.) 10 6301 (RV: Pi. 2:35:216, figs. 1-3; Pi.

2:35:218, figs. 1-4), 10 6302 (LV: Pi. 2:35:220, figs. 1, 2), 10 6303

(LV: Pi. 2:35:222, fig. 1), 10 6304 (RV: Pi. 2:35:222, fig. 2). All

figured specimens were obtained from the type locality.

Explanation of Plate 2:35:216

Figs. 1-3, RV (10 6301, 1000 ym long) : fig. 1, ant.; fig. 2, ext. lat.; fig. 3, post.

Scale A (250 ym ; x85) , figs. 1-3.

Stereo-Atlas of Ostracod Shells, 2:35:217 Kellettina carnica (3 of 8)

Diagnosis: A species of Kellettina with well developed velar and marginal

structures. Velum perforate, edge joined to domicilium throughout

length by a system of narrow, strut-like connections. Frill-like

marginal structure similarly perforate. Reticulation fine on most

of valve surface, slightly coarser on nodes. Valves preplete. Cristae

absent.

Remarks: Kellettina carnica forms part of a silicified ostracod fauna

including the genus Gortanella Ruggieri (1966, Riv. ital. Paleont.

Stratigr. , vol. 72, no. 1, pp. 1-8). The delicate marginal structure

of K. carnica is not, in the material available, found complete, though

like the velar structure it too appears to have a continuous distal

edge (see Pi. 2:35:216, fig. 2). The shape (crescent-like anteriorly

and posteriorly) and extent (entire and, except medioventrally , very

wide) of the frill-like marginal structure recalls that described

elsewhere from the beyrichiacean genus Craspedobolbina Kummerow, 1924

(see Martinsson, 1962, Bull. geol. Inst. Univ. Uppsala, vol. XLI, p.74).

The holotype and paratypes (U.S.N.M. 85449, 85449a-h) of the

American type-species of Kellettina [K. robusta (Kellett, 1933)] have

been examined; radial 'ribbing' is visible externally throughout the

length of both the marginal and velar structures (see also Kellettina

vidriensis Hamilton, 1942 in Sohn, 1954, Prof. Pap. U. S. geol. Surv. ,

264-A, p. 8) , but the structures themselves are not perforate.

Explanation of Plate 2:35:218

Figs. 1-4, RV (10 6301): fig. 1, vent.; fig. 2, dors.; fig. 3, detail of ornament, post,

node; fig. 4, detail of ornament, ant. node.

Scale A (250 ym ; x85) , figs. 1, 2; scale B (100 ym ; x180) , figs. 3, 4.

Stereo-Atlas of Ostracod Shells, 2:35:218 Kellettina carnica (4 of 8)

Stereo-Atlas of Ostracod Shells, 2:35:219 Kellettina carnica (5 of 8)

Remarks (contd. ) : The morphology of the velar and marginal structures of K. carnica is

alone sufficient to distinguish this species from all known congeneric

taxa. K. carnica further differs from other Kellettina species by its

obvious preplete shape, by the conspicuous height of its nodes above

the hinge line, and by its rather wide sulcus. Unlike K. robusta ,

K. carnica has no crista (sensu Martinsson, op. cit. , p. 78).

The hinge structure of the right valve in K. carnica consists of a

prominent dorsal groove bordered ventral ly along its entire length by a

somewhat narrower ridge. At each cardinal corner this ridge links

directly to a small, simple tooth (see Pi. 2:35:222, fig. 2). The left

valve has corresponding terminal sockets and, dorsally, a well

developed ridge. Below the latter in each of the left valves available,

the hinge structure (like the internal surfaces of all the valves) is

unfortunately masked by a coating of secondary origin; it is here that

one might expect to find a fine groove to accommodate the ridge of the

right valve. The apparent crenulations along this ventral part of the

left hinge shown in Pi. 2:35:220, fig. 1 have not been confirmed in

other specimens and are considered to be artefacts formed by this

secondary 'lining'.

Explanation of Plate 2:35:220

Figs. 1, 2, LV (10 6302, 975 ym long): fig. 1, int. lat.; fig. 2, ext. lat.

Scale A (250 ym ; *85), figs. 1, 2.

Stereo-Atlas of Ostracod Shells, 2:35:221 Kellettina carnica (7 of 8)

Distribution: So far known only from the type locality, northern Italy.

Acknowledgements: Thanks are due to Drs. R. H. Benson and F. J. Collier, Smithsonian

Institution, Washington, for the loan of the type material of

Kellettina robusta (Kellett) .

Explanation of Plate 2:35:222

Fig. 1, LV ext. lat. (10 6303, 985 ym long); fig. 2, RV int. lat. (10 6304, 975 ym long).

Scale A (250 ym ; *85) , figs. 1, 2.

Stereo-Atlas of Ostracod Shells, 2:35:222

Kellettina carnica (8 of 8)

Stereo-Atlas of Ostracod Shells, 2:35:220

Kellettina carnica (6 of 8)

STEREO -ATLAS OF OSTRACOD SHELLS

Contents, Volume 2, Part 3

2:23:141-148 On Cluthia keiji Neale sp. nov. ; by J. W. Neale (£0.90)

2:24:149-156 On Hirsckmannia viridis (0. F. Muller) ; by J. E. Whittaker (£0.90)

2:25:157-164 On Lophocy there (Lophocy there) ostreata (Jones and Sherbom) ; by C. Mayes (£0.90)

2:26:165-172 On Lophocythere (Neurocy there) bradiana (Jones); by C. Mayes (£0.90)

2:27:173-180 On Progonocythere stilla Sylvester-Bradley; by C. Mayes (£0.90)

2:28:181-190 On Argenticytheretta (Argenticytheretta) patagoniensis Rose sp. nov.; by J. F.

Rose ' (£1.00)

2:29:191-194 On Argenticytheretta (Argenticytheretta) gonzalezi Rose sp. nov.; by J. F. Rose (£0.45)

2:30:195-198 On. Argenticytheretta (Argenticytheretta) riescoensis Rose sp. nov.; by J. F. Rose (£0.45)

2:31:199-202 On Argenticytheretta (Argenticytheretta) fuegoensis Rose sp. nov.; by J. F. Rose (£0.45)

2:32:203-206 On Argenticytheretta (Magallanella) chileana Rose subgen. et sp. nov.; bv J. F.

Rose ' (£0.45)

2:33:207-210 On Argenticytheretta (Chilea) brunswickensis Rose subgen. et sp. nov.; by J. F.

Rose ' (£0.45)

2:34:211-214 On Homibrookella anna (Lienenklaus) ; by A. A. F. Al-Furaih (£0.45)

2:35:215-222 On Kellettina camica Ruggieri and Siveter sp. nov.; by G. Ruggieri and David J.

Siveter (£0.90)

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