Chapman. 1 



Pliocene Ostracodci. 



97 



anterior and posterior extremities compressed and sharp. Dorsal 

 margin well arched ; ventral margin slightly hollow ; ventral edges 

 of valves sinuous and mutually overlapping. • End view of carapace, 

 ovoid, but pointed. Length, one-twentieth of an inch; height, one- 

 thirty-sixth of an inch. In general outline this Ostracod shows some 

 resemblance both to Cypris virens (J urine),* and to Cypridopsis (?) 

 Newtoni, Brady and Robertson. f. As regards the first-named, how- 

 ever, our specimens are too low, the dorsal margin is not so strongly 

 curved, and the posterior margin is less rounded and narrower. 

 Whilst as distinguished from the latter form, the Californian speci- 

 mens have more evenly pointed ends, with the posterior region 

 scarcely thicker than the anterior ; and, moreover, the anterior bor- 

 der of the valve is more evenly rounded. It is difficult to deter- 

 mine without doubt the generic affinities of these specimens, but 

 they probably present most points of resemblance to the genus 

 Cypris, and, moreover, show the feeble overlapping of the edges o 

 the valves, which is somewhat characteristic of the genus. 



Cypris procera was found at locality No. 589, Wild Cat Canon, 

 one specimen ; and at locality No. 297, Bollinger Canon, one speci- 

 men. 



Erpetocypris, Brady and Norman, 1889. 



Erpetocypris Merriamiana, sp. nov., plate 3, figs. 10-12. 



Shell laterally sub-reniform, highest at the middle. Anterior 

 and posterior extremities obliquely rounded. Dorsal margin 

 strongly arched ; ventral border sinuous, hollowed near the middle. 

 The antero-dorsal region depressed and hollowed. Ventral edge 

 view sub-pyriform ; well rounded and swollen at the posterior end, 

 and tapering to a sharp edge anteriorly. Length, one-seventeenth 

 of an inch ; height, one-thirtieth of an inch. 



This striking species does not exactly correspond with any of 

 our recent types, but seems to be not far removed from Erpetocy- 

 pris tnmefacta (Brady and Robertson).^ 



*See Brady, Crosskey, and Robertson, 1874, Mon. Post-tert. Entom., pi. 

 II, figs. 27, 28. 



^Idem, ibid., pi. II, figs. 20, 21. 



tSee Brady and Norman, 1S89, Trans. R. Dublin Soc, ser. II, vol. IV, p. 

 87, pi. VIII, figs. 5-7- 



