EXPLANATION OF PLATE XXXIV. 



CuCUlvLAEA WOODBURYENSIS n. Sp., p. 393 



i. The type specimen, an internal cast of a left valve. 

 Woodbury clay; Lorillard, (102). 



ARCA QUINDECEMRADIATA Gabb, .p. 410 



2-3. Views of the left side and the posterior end of a nearly per- 

 fect internal cast. 



Vincentown limesand; Hurffville, (/7/). 



ARCA ROSTELLATA Morton, p. 408 



4-5. Views of the right side and dorsal margin of a very perfect 

 internal cast figured by Whitfield. 

 Nave sink marl; Holm del. 



ARCA UNIOPSIS Conrad, p. 407 



6. An internal cast of the right valve. 



Navesink marl; Crosswicks Creek, (149). 



7-8. Left and dorsal views of a nearly complete internal cast. 

 (After Whitfield.) 



ARCA OBESA (Whitfield), p. 409 



9. The internal cast of a right valve. 



Merchantville clay-marl; Lenola, (163}. 



ARCA sp. 



10-12. Views of three internal casts. 



Vincentown formation; near Deal, (122). 



950 



