Shell resembling that of Basilissa, nacreous under a porcellaneous layer, small, conical, with nearly flat base and rhomboidal aperture, broadly umbilicate; outer lip with a shallow sinus adjacent to the suture and another, broad and shallow, in the peripheral half of the basal part; columella with a blunt terminal tubercle but not strongly toothed, columellar lip reflected as a band of callus within the umbilicus, subsequently forming a callous septum completely sealing the umbilical opening in fully developed shells.

The peculiar band of callus laid down within the umbilicus behind the columella, and the final closure of the umbilicus by a smooth callous septum are highly distinctive features; the former extends high within the spire and would be visible even in young shells without the umbilical septum or in shells having the septum broken away.