Pupide. 
Buliminus, Hhrdg., 1831. 
Pupa, Drap, 1805. 
Vertigo, Miller, 1774. 
Balea, Prideauz, 1824. 
Clausilia, Drap., 1805. 
Stenogyride. 
Cecilioides (Fér.), Blvlde, 1817. 
Cochlicopa (Fér.), Risso, 1821. 
Azeca (Leach), Fleming, 1828. 
The nomenclature as revised by Mr. Smith has been followed in these 
three genera. 
Succineidee. 
Succinea, Drap., 1801. 
B. DITREMATA. 
Onchidiidee. 
Onchidiella, Gray, 1850. 
SUB-ORDER GEHYDROPHILA. 
Auriculide. 
Carychium, Miller, 1744. 
Alexia (Leach), Gray, 1847. 
Otinide. 
Otina, Gray, 1847. 
SUB-ORDER HYGROPHILA. 
Limnaeide. 
Ancylus, Geoffroy, 1767. 
Limnaea, Lam., 1801. 
Amphipeplea, Nilsson, 1822. 
Planorbis, Guettard, 1756. 
Physidee. 
Physa, Drap., 1801. 
Aplexa, Fleming, 1828, 
