Shell small, ovate-conic, imperforate, moderately solid, very often much eroded. Sculpture consisting of regular fine and shallow spiral grooves, more distant below the suture and subobsolete on the base ; crossed by irregular oblique growth-striae and folds. Colour ; Apex brown, the succeeding whorls with the upper half white, the lower blue, the last whorl white with a peripheral blue band ; mouth and columella brown. Spire acute, conical, about the same height as the aperture, outlines slightly convex. Protoconch acutely conical, of 3 smooth, brown, flat, and polished whorls. Whorls 7, first slowly, the last very rapidly increasing, flatly convex, the last angled below the periphery ; base flatly rounded. Suture not deep. Aperture oblique, oval, angled above. Peristome discontinuous, sharp. Outer lip with a narrow yellowish margin inside. Columella oblique, arcuate, broad, and flatly excavated, a very narrow groove on the outside ; parietal wall with a thin white callus. Operculum normal.Diameter, 6 mm. ; height, 9,5 mm. Diameter, 6,5 mm. ; height, 12 mm.: angle of spire, 43°.
New Zealand: Common on rocks at and above high-water mark throughout New Zealand and at the Chatham Islands ; Lord Howe Island, Tasmania, Australia, Mauritius, Ceylon, Nicobars, Malay Archipelago.