Prof. T. Rupert Jones — Fossil Ostracoda, Colorado. 147 



This species is named after Dr. A. C. White, Palaeontologist of 

 the U.S. Geological Survey, Washington, who kindly submitted 

 these interesting Colorado specimens for my examination. 



Another fossil Metacypris was described and figured some years 

 ago as Cypris strangulata, Jones (Quart. Journ. Geol. Soc. vol. xvi. 

 1860, p. 187, pi. 10, figs. 73a, 6, c, d, comprising probably two 

 species), from the Tertiary beds of Central India, at Pahadsingha 

 and Butara, both in the Province of Nagpur (op. cit. pp. 165, 166). 



4. Darwinula legtjminella (E. Forbes). PI. TV. Figs. 4a, 46, 4c. 



D. leguminella (E. Forbes), Jones, Q. J. G. S. vol. xli. 1885, p. 346, pi. 8, 

 figs. 30 and 31 ; and in Bullet. U. S. Geol. Surv. February (?), 1886. 



It is evident that, judging from the shape and size of the carapace, 

 we must refer these American specimens, which are not rare, to the 

 same genus and species as determined for the similar little Purbeck- 

 Wealden Ostracods of England and Hanover. 



Darwinula Stevensoni, Brady and Robertson, lives at present in the 

 brackish water of tidal rivers, and has been found fossil in late 

 Tertiary deposits belonging to the Forest-bed series of Suffolk. 

 D. Berniciana, Jones (Proceed. Berwicksh. Nat. Club, 1884, vol. x. 

 p. 325), is a Lower-Carboniferous form in Northumberland, and 

 J>.? pungens, J. and K., occurs in the Coal-measures of Scotland. 

 Another probable Barioinula is the Cypris (?) Allportiana, Jones, from 

 the Neocomian * freshwater beds near Bahia, in Brazil ; see Q. J. G. S. 

 1860, vol. xvi. p. 267, pi. 16, fig. 16. 



5. Cypris Ptjrbeckensis, E. Forbes. PL IV. Figs. 5a, 56, 5c. 

 Cypris Purbechensis, E. Forbes. Jones, Q,. J. G. S. 1885, vol. xli. p. 347, pi. 9, 

 figs. 1-6. 



The figured carapace, Fig. 5a, corresponds with fig. 5, in pi. 9, 

 Q. J. G. S. ; and Fig. 56 nearly with fig. 4 of that plate, in which 

 various forms of this species are given. It is common in the English 

 Purbeck beds, but rare and smaller in the sample from Colorado. 



6. Cytherideis Marshii, sp. nov. PI. IV. Fig. 6a, 66, 6c. 



This carapace, apparently perfect (showing the translucent edges 

 of the closed valves), approaches very near to Cytherideis trigonalis, 

 Jones, Monogr. Tertiary Entom., Pal. Soc. 1856, p. 47, pi. 2, figs. 

 2a-2h ; but the curve and slope of the front margin differ, this end 

 being slightly blunter in the American form. The greatest con- 

 vexity, also, is rather ventral than along the middle. Bare. 



This species is named after the eminent palaeontologist who has 

 worked so enthusiastically and successfully in these highly interesting 

 fossiliferous deposits of the Far West. 



7. Cytheridea? atlantosatjrica, sp. nov. PI. IV. Figs. 7a, 76, 7c. 



An oblong, convex carapace, round-ended, with the anterior rather 



higher (broader) than the other end, and slightly oblique. Valves 



somewhat undulate, being faintly impressed in the postero-dorsal 



1 Referred to the Neocomian by Dr. A. .C. White in a work prepared by him for 

 publication by the Brazilian (jovernmeut. 



