Plate LO. 
Se 
|. AMPULLARIA FLAGELLATA , Say. 
2, NERITELLA SHOWALTERIT, Lea. 
B.VALVATA HUMERALIS, Say. 
4..V. VIRENS, Tryon, 
5. BITHINELLA FLORIDANA, 
6.B.OBTUSA, Loe 
7B INTER MEDIA, © 
§,.B. BINNEY], % 
9B. SEEMANI, I'rauent. 
FrowcenS, 
