Shell small, oblong, equilateral, anterior dorsal margin concave, posterior dorsal margin convex, tapering more anteriorly than posteriorly. Colour grey, with radiating and concentric lines of pale yellow. Sculpture : the whole shell is densely covered with small but sharp, elevated grains arranged radially. Height 2,9, length 4,55 mm.
Hab.—Sixteen miles east of Wollongong in 100 fathoms; dredged by Mr. G. H. Halligan and self.
Type.—To be presented to the Australian Museum. This species is represented only by a single left valve. The sculpture, like sand-paper, is a remarkable character, and members of this genus are usually inequilateral. Though more material is requisite for a full description, these peculiarities should ensure recognition.