THE MOLLUSCA 

 PHYSIDAE 



FIG. VI. Physa humerosa Gld. 



ANCYLIDAE 



975 



FlG. VII. Gundlachia meekiana Stimp. 



AMPULLARIIDAE 



FIG. VIII. Ampullaria paludosa Say. 



VlVIPARIDAE 



FIG. IX. Viviparus intertextus Say. 



. X. Valvata tricarinata Say. 



