9 8 



University of California. 



[Vol. 2. 



The hard limestone from locality No. 585, Wild Cat Canon, is for 

 the greater part composed of the carapaces of this species. It is also 

 found in the friable specimens from the same locality, where it is 

 common ; and at locality No. 297, Bollinger Caiion, where it again 

 forms the greater part of the rock. 



Erpetocypris lata< sp. nov., plate 3, figs. 13-15. 



Valves bean-shaped laterally. Dorsal edge strongly arched 

 and rounded off towards the ventral side, which is nearly straight. 

 In edge view this form somewhat resembles the previous one, but 

 the carapace is not so full in E. lata, and the posterior extremity 

 not so well rounded in the aspect mentioned. Length, one-twelfth 

 of an inch ; height, one-twenty-fifth of an inch. 



At locality No. 585 this species is frequent; and at locality No. 

 297, Bollinger Canon, two specimens. 



Cypridopsis, Brady, 1S68. 



Cypridopsis plioca?nica, sp. nov., plate 3, figs. 16-18. 



Valves sub-ovate, ends evenlv rounded; highest, near the ante- 

 rior end of the valve. Dorsal edge strongly curved ; ventral margin 

 straight. Carapace somewhat compressed, but with the ventral 

 border fairly steep, or blunt in edge view. Length, one-twenty- 

 sixth of an inch ; height, one-forty-fourth of an inch. 



The above form appears to be closely allied to Cypridopsis 

 vidua (Miiller)* in their general outline ; but the two forms have 

 many points of difference. The carapace of C. pliocamica is com- 

 pressed as compared with C. vidua. In the latter species* also the 

 ventral margin is incurved, whilst that of C plioccenica is nearly 

 straight. 



It is interesting to note here that the genus Cypridopsis contains 

 species which are found in brackish as well as fresh water. 



C. pliocccnica was found at locality No. 587, San Pablo Valley, 

 two specimens. 



Candona, Baird, 1850. 



Candoua Candida (MiillerJ, var. deprcssa, nov., plate 3, fig. 19.- 

 This is a variety not altogether unlike C. Candida var. tumida, 



* Cypridopsis vidua, Brady, 186S, Mori. Rec. Brit. Ostrac, p. 375, pi. XXIV, 

 figs. 27-36, 46. 



