- Planorbis, Type P. subcrenatus, Cpr.
- Helisoma, Sw., Type H. ammon, Gld.
- Menetus, H. & A. Ads., Type M. opercularis, Gld.
- Carinifex, W. G. Binney.
- Type C. Newberryi, Lea.
Subfamily Ancylinæ.
W. C. Genera:
- Ancylus, Geoffr.
- Type A. Newberryi, Lea.
- Acroloxus, Beck.
- Type A. Nuttallii, Lea.
- Gundlachia, Pfr.
- Type G. Californica, Rowell.
Subfamily Pompholinæ, Dall.
Testa depressa, paucis spiralis, anf. ult. maxima. Columella recta, sine plica.
Animalis tentaculis longis, oculiferis, et alius par oculorum, in bases interiores tentaculorum.