Shell large, vermiform, subsolitary or agglomerated, irregularly twisted, brownish. Sculpture consisting of rugose growth - stride, crossed by unequal longitudinal lines and riblets, mostly distinctly moniliform; the longitudinal sculpture is predominant, but very often the surface is irregularly reticulated by the distinct growth-marks. There are no internal septa, and no operculum. Transverse section subcircular.
Animal having a long and oval cephalic shield ; tentacles short, with the eyes at a certain distance from the base; 2 small and rather short tubercles in front of the mouth; foot extending beyond the head, cross-shaped. The whole of the body is light brown, the foot with white spots in front * the mantle is white, its margin brown.
Type in the Mus. Hist. Nat., Geneva.
Hab.—New Zealand. North and South Islands, from between tide-marks to about 25 fathoms ; Chatham Islands.
The type is from Australia, and it occurs also in Tasmania. Fossil in the Pliocene and Miocene.