Shell small, narrowly pyramidal, white, with two orange bands. Whorls five, rounded, suture well impressed, faintly axially costate; first three whorls, and base smooth. There is a narrow orange band at the periphery, which just shows above the suture on the spire; a second is on the middle of the base. Aperture roughly quadrangular Columella straight and upright; behind it an umbilical chink; outer lip sharp; the front lip bends back towards the axis of the shell.
Length 2.5 mm Breadth 1.4 mm
Type, with several others, mostly broken, from 40 fathoms, off Thouin Bay. It resembles C. erratica, May, which is smaller, of a thinner texture, a rounder mouth, and without the colour bands.