Shell elevated, round-backed, apex incurved, projecting beyond the edge of the base, anterior slope very convex, posterior slope almost perpendicular. Colour cream. Slit long, about one-fourth the length of anterior slope, furrow a channel showing distant growth bridges, the edges a little uneven. Sculpture consisting of about twenty primary ribs, with about an equal number of subordinate ones crossed by twenty to forty concentric ridges, forming indistinct nodulation at points of intersection and shallow pits at intervals.
Length 8.5; breadth 5.5; height 4 mm.

From 128 fathoms, twenty miles east of Maria Island, Tasmania.