The Probert Encyclopaedia of Nature

GASTROPOD

The gastropods (Gastropoda) are a class of mollusc, consisting of animals generally inhabiting a univalve shell, although some of the group are wholly devoid of a shell. Generally the shell is cone-shaped and spiral. The distinguishing characteristic however, is the foot, which is broad, muscular, disc-like and attached to the ventral surface.
Research Gastropod