270 AMERICAN JOURNAL 



CRASSATELLA, Lara. 



The two species of Crassatella, described and figured in vol. 

 ii., p. 104, as C. peralta and C. planata I have since found in 

 the Cretaceous marl near Barnsboro'. They are not found in 

 Miocene, as I supposed from the locality named on the specimens 

 in the collection of the Academy. 



Recent Species. 



VENUS, Lin. 

 V. PULICARIA, Brod. 



A specimen from Cape St. Lucas, Lower California, marked 

 by Mr. Carpenter pulicaria with a mark of doubt, and labelled 

 var. lilacina is in the Academy's collection. It is closely rela- 

 ted to V. intapurpurea, Con., from Florida, but diifers in the fol- 

 lowing characters : The ribs are thin, and fimbriated ; but in 

 the Florida shell they are thick, not fimbriated and more pro- 

 foundly imbricated. It is also a comparatively shorter shell and 

 less ventricose. 



PURPURA, Lam. 



Purpura Floridana, Conrad. 



P. hcemosto7)ia, var. Dunker not Lin. Index Moll. pi. 3, 

 fig. 14. 



P. NEBULOSA, Conrad. Dunker, ib. fig. 15. 



This species is readily distinguished by its large distant tuber- 

 (Cles, and it is a thicker shell than the former. 



