Shell solid, oval, of 4 whorls. Apex markedly papillate. .Spire completely covered with callus, almost obliterating the sutures, which are indicated by shallow furrows, between which over each whorl are some three low, broad spiral ridges. Aperture triangularly-oval, narrow behind, widely open in front, truncated, and widely notched. Outer lip simple, thin, with a callous thickening in its upper sixth, and with a tooth near its anterior end. Inner lip a thick callus, extending beyond the aperture, and up over the spire, where it recedes in steps just above each sutural groove. Columella nearly straight, truncate, with six oblique curved plaits in front. The body-whorl has two approximate grooves, winding round its base from above the middle of the aperture, the upper one to the labral tooth, the lower to just above the notch; a third lies above a band of callus extending from just above the columellar plaits to the left pillar of the notch ; another groove bounds, at its lower edge, the spiral callus which spreads down from the suture and thickens the back of the outer lip. The body-whorl between these grooves has sublenticular axial and spiral scratchings, and has a faint-bluish-grey tint, whereas the callus is milk-white.
Dim.—Length, 20,5 mm.; of the aperture, 12 mm.; width, 9,5 mm.