Elongately ovate, equilateral, white, auriculate; hinge almost straight, edentulous; sculpture of about 20 sharp radial ribs, narrower than the interstices; anterior and posterior ends smooth. Length 22 mm, height 38 mm, section 20 mm. Type locality: Moreton Bay. Loc.: Beachport to Bunbury, beach and dredged to 300 fathoms. S.W.A, S.A, Tas, Vict, N.S.W, Q.