Adult shell roughly and irregularly involute in the sam« plane, yellowish, sculptured by numerous lamellar growth lines and periodic mouths. The nucleus is embraced and almost concealed by the first turns of the adult. It is naticoid in form, of about three turns, at first flattened and smooth; axial ribs develop on the last whorl, and become stronger until they reach the lip; mouth ovate, much produced in front. Columella expanded over a small umbilicus. Colour purplish-brown, with a golden shine.
Dimensions of nucleus - Height 1.2 mm Diameter 1.5 mm Major diameter of adult about 8 mm.
Type, from Frederick Henry Bay, 6aken from kelp roots The nucleus shell is occasionally found in dredgings.