A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under pond.
A large genus of pond-snails or fresh-water gastropods of household Limnæidæ, or made sort of the Physidæ, getting the layer sinistral.
[lowercase] A pond-snail regarding the genus Physa.
[lowercase; pl. physæ (-sē).] In some anthozoans, as Edwardsia, the reduced end associated with body. It would likely or may possibly not be retractile into the scapus. Compare capitulum, 6, and scapus, 6.