Although several workers have commented upon the characters of the right valve in this species, it has never been figured. Left valves occur commonly in shell sand at Lyall Bay and a single right valve has been found in association with them. This is figured for comparison with the other species discussed below. It is considerably flatter than the left valve. Anterior ear with deep byssal sinus, sculptured with two indistinct radials. Posterior ear only slightly differentiated from the disc. Surface of valve with close, microscopic, concentric lines crossed by fine, rather irregular radials. The strength of sculpture varies rather considerably in the left valve. Suter's original specimen was rather worn and two fresh valves from Lyall Bay are figured to show the range of variation.