Shell minute, turbinate, umbilicate, smooth and glossy. Sculpture absent, except for the microscopic growth-striae. Colour white, fresh specimens vitreous. Spire conoidal, small, height a little less than that of the aperture. Protoconch consists of 1 whorl, which is smooth and rounded. Whorls 4, much rounded, the last propor¬tionately large; base convex. Suture deep. Aperture subcircular, broadly angled above, but little excavated by the body-whorl. Outer lip sharp, forming a half-circle with the basal lip. Columella concave and reflected, thickened. Inner lip spread as a thin layer upon the parietal wall. Umbilicus with its area small and with a somewhat sharply defined margin, the perforation narrow. Diameter, 1,75 mm. ; height, 1,75 mm. New Zealand: About 15 miles outside Great Barrier Island, in 110 fathoms.
It is a much smaller shell than C. neozelanica, more globular, with the aperture more circular, and better and differently defined umbilical area.