Shell oblong-oval, fusiform, corneous, epidermis thin, shining ; spire more or less elevated, of 6 or 8 whorls; columella thin, arcuated, truncated at base ; aperture rather narrow, longitudinal ; lip simple, sharp. Animal much longer than the shell, when extended ; oculiferous tentacles deflected at the tips, beyond the eyes ; inferior tentacles much shorter, also deflected; lips elongated, tentacular. Predaceous. The largest species of the family belong to this group, the shells sometimes attaining a length of over 3 inches.