THE 
GHOLOGICAL MAGAZINE. 
NEWMSSHIESS DECADE lll, VOL. x, 
No. IX.—SEPTEMBER, 1893. 
Ore eae, AE oe @S te sea SS = 
T.—On Some Fosstzn Osrracopa rrom §.-W. Wyominc, anD FROM 
Uran, U.S.A. 
By Prof. T. Ruprrt Jonszs, F.R.S., F.G.8., Etc. 
(PLATE XY.) 
Contents. 
§ 1. Introduction. 
§ 2. Description of the Species. 
. Cypris Purbeckensis, EK. Forbes. 
. Oypridea tuber culata (Sow.), var. Wyomingensis, nov. 
. Potamocypris affinis, sp. nov. 
unisulcata, Jones. 
. Candona subreniformis, sp. nov. 
subovata, Sp. Nov. 
. Metacypris subcordata, sp. nov. 
consobrina, sp. Nov. 
cuneiformis, Sp. NOV. 
simplex, Sp. NOV. 
11. Cythere monticula, sp. Dov. 
12. Cytheridea truncata, sp. nov. 
— 
SOONAMPWNHE 
13. ———— tenuis, sp. nov. 
14. Cytherideis equalis, sp. nov. 
15. ————— wmpressa, sp. nov. 
§ 1. Introduction. 
In 1885 Dr. C. A. White, F.C.G.8., Palzontologist to the U.S. 
Geological Survey, supplied me with some of the siliceous residue 
of a limestone belonging to the freshwater Jurassic Atlantosaurus- 
beds in Colorado, from which several casts of small Ostracoda were 
figured and described in the Geonocican Magazine,’ Dec. (III. 
Vol. III. April, 1886, pp. 145-8, Pl. IV. Since that time Dr. White 
has kindly sent me somewhat similar material, obtained in like 
manner, by dissolving in dilute acid pieces of an impure limestone, 
which lies at the base of the Upper Cretaceous Series, from Cokeville, 
a hamlet in South-Western Wyoming, and belongs to the Bear- 
River Formation. The Ostracoda selected are figured in Plate XV. 
Figs. 1-9, 11-13, and 15. These casts represent ‘the whole carapace 
in many if not all instances. 
All the known fossils from the deposit yielding these specimens, 
Dr. White tells me, are either fresh-water or brackish-water forms 
(none marine). Of these under notice, however, Higs. 11 and 12 
belong to a marine genus. The Ohara, occurring abundantly 
with these fossils from §.-W. Wyoming, has been ‘published by 
1 Also noticed in the “ Bulletin U.S. Geol. Survey,’ No. 29, May, 1889. 
DECADE I1I.—VOL. X.—NO. IX. 25 
