a small grouping of Pulmonifera having the eyes at foot of the tentacles like the common pond snails
- A group of Pulmonifera obtaining the eyes during the root of the tentacles, including the common pond snails.
(n. pl.) Several Pulmonifera getting the eyes at the foot of the tentacles, including the typical pond snails.
Originally in this condition the female aperture is at some distance from the male, as in the Basommatophora and in other cases; but in some forms the female aperture itself has shifted and come to be contiguous with the male opening and penis as in the Stylommatophora.