THE MOLLUSCA 

 Physidae 



Fig. VI. Physa humerosa GId. 



Ancylidae 



Fig. VII. Gundlachia meekiana Stimp. 



Ampullariidae 



Fig. VIII. Ampullaria paludosa Say. 



975 



C 



Fig. IX. Viviparus inlertextus Say. 



Valvatidae 



r\ 



Fig. X. Vdlvata tricarinata Say. 



