8 



Calyptraeidse. 



Crepidula nnguiformis. Lam. 

 Crepidula fornicata, Liji. 

 Crepidula glauca, Say. 

 Crepidula convexa, Say. 



* Crucibulum striatum. Say. 



Fissurellidaet 



Cemoria noachina, Lin. 



Jaiittiinidae* 



* Janthina fragilis, Bmg. 



Trocliidae. , 



* Adeorbis costulata, Moil. 



* Margarita minutissima, Migh. 

 Margarita undulata, Sowh. 



* Margarita helicina, 0. Fahr. 

 Margarita argentata, Gld. 

 Margarita obscura. Couth. 



* Margarita acuminata, Migh. 



* Margarita -s-aricosa, Migh. 



* Margarita cinerea^ Couth. 



* Troclius occidentalism, Migh. 



Paludinidse. 



Valvata tricarinata, Say. 

 Valvata pupoidea, Gld. 



* Melantho decisa, Say. 



* Melantho Integra, Say. 



* Amnicola pallida, Hald. 

 Amnicola limosa, Say. 



* Amnicola granum, Say. 



* Pomatiopsis lapidaria, Say. 



Littorinidae. 

 Skenea planorbis, 0. Fahr. 



* Rissoella? eburnea, Stm. 



* Rissoella? sulcosaj Migh. 



