Other distinctive features include a smooth, green columella, an open, black-ringed umbilicus. The columellar margin is thickened at the base of the shell, and has a very obtuse tubercle there. The rounded-quadrangular aperture is angular above and brilliantly nacreous inside. It is sealed with an operculum made of protein rather than calcium carbonate. The operculum is circular, multispiral, with a central nucleus. The fleshy foot of the snail is a bright reddish orange with black speckling lining the basal margin. Four elongate epipodial tentacles are spaced evenly along both sides of the muscular foot.Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
