AMERICAN JOURNAL OF CONCHOLOGY. Plate 3. 



Fig. 1. lo fluvialia, Say. 

 •' 2. " fluviaUx, Say. 

 " ;>. " inermis, Anth. 



Fig. 4. lo verrucosa, Reeve. 

 " .■). " lurida, Anth. 

 " 6. " rhomhica, Anth. 



