Shell small, oblique, triangularly ovate, moderately inflated, inequilateral, clothed with a tough persistent buff epidermis. Beak prominent, set at about three-quarters of the length. Upper and central portion of the valve with fine, irregular, concentric growth lines, the lower half with about 50 delicate and crowded radial riblets: Interior brilliantly nacreous, with a silver lustre; the radials show an imprint, and denticulate the inner margin of the valve. Muscle scars not visible. Hinge with the chondrophore apart from the teeth, of which there are five tubercles and sockets on the posterior side and three on the anterior. Length, 2.2; height, l.7mm.