Shell small, thin, semitransparent, subcylindrical, rounded at each end, straight on the ventral and postero-dorsal margins, compressed medially. Colour uniform pale buff. Epidermis thin, persistent, slightly wrinkled. Surface glossy. Sculpture, fine, concentric, raised threads. Umbos prominent, at one-third of the total length from the anterior end. Within, a raised rounded clavicle extends from the hinge to the antero-ventral margin. The pallial sinus is short. In the left valve are an anterior vertical and a posterior horizontal cardinal. These are clasped in the right valve by two anterior and posterior cardinals respectively. Length, 31; height, 8,5 mm.
Hab. —Plentiful, as dead shells, on the beach near Cardwell, Queensland (type), and again at Cairns (self, 1901 and 1906).
For Cultellus, the value given by Dall as equivalent to Pharus is here adopted. This genus does not seem to have been previously noted as represented in Australia. Monographers have so regularly omitted to give characters from the interior of the valve, that comparisons with foreign species are difficult. Perhaps Cultellus vitreus Dunker,f from Singapore, is related.