- Limnæa, Lam.
Subgenera:
- Limnæa, Type L. stagnalis, Lin.
- Limnophysa, Fitz., Type L. palustris, Müll.
- Physa, Drap.
Subgenera:
- Physa, Type P. heterostropha, Say.
- Bulinus, H. & A. Ads., Type B. hypnorum, Lin.
Subfamily Planorbinæ.
W. C. Genera:
- Planorbis, Guett.
Subgenera: