ZOOLOGY. MOLLUSCA. 171 



Cypraca cinerea, Gmel. 



Also occurs as a sub-fossil. 



Trivia quadripunctata, Gray. 



Bahamas. 



Trivia suffusa, Gray. 



Bahamas. 



I believe that these two forms are merely varieties of one 

 and the same species, being connected by a number of inter- 

 mediate types. 



Cyphoma gibbosa, L. 



Florida, Cuba. 



Dolium perdix, L. 



W. Indies, Pacific Islands. 



Natica canrena, L. 



Florida, W. Indies, Costa Rica. 



The nidus of probably this species, which we found in the 

 Flatts Inlet, is a collar of lime-mud, in form very much like 

 that of Natica heros, of the east American coast. 



Natica lactea, Guild. 



This species is very close to, if not identical with, Natica 

 Flamingiana, Reel., from the Feejee Islands. 



Natica Marochinensis, Gmel. 



W. Indies, W. Africa, Sandwich Islands. 



Crepidula convexa, Say. 



Eastern United States. 



Two small specimens obtained through the kindness of Miss 

 A. Peniston, which are seemingly this species. 



1 Crepidula fornicata, L. (young.) 

 Phorus agglutinans, L. 



This is probably a rare shell. We obtained but a single 

 specimen from the rocks off Bailey's Bay. 



