Shell pale straw color or yellowish white, glistening, sculptured with fine somewhat irregular, rounded concentric incremental ridges, hardly elevated above the general surface; valves full, evenly rounded below and behind, with a few, inconstant, extremely faint, radiating impressions behind the beaks which do not essentially modify the margin or the sculpture; beaks rather anterior, full, not bulbous; a feeble impressed line proceeding from them marks the boundary of the lunule; above and below this are two other slight flexures not concentrated into lines, of which the lower one coincides with an extremely faint wave on the margin ; interior white, polished ; muscular scars narrow, the pallial line simple with an extremely faint flexure just before it joins the posterior adductor scar; scar of the pedal muscle just above the anterior adductor, small, elongate-triangular, deep; margin smooth simple. Longitude of shell 28; altitude 22 ; diameter 15mm.

On a cursory examination this species was referred to the Vesicomya section of the genus, but from a more thorough study it became evident that it was more nearly allied to the typical Callocardia. The ligament is delicate and though somewhat inset is wholly external. The anterior dental lamina in the right valve has an elevated equilateral triangular point; the upper lamina is also triangular, but has a short anterior side and a long gradual posterior slope, the edge of which is slightly undulated and grooved above, so that, while really continuous with the posterior lamina which is slightly thicker, a vertical view gives the impression of two teeth. The anterior lamina is the largest. Close to the outer margin of the ligamentary furrow is a well marked ridge which forms the boundary of the escutcheon, but is hardly visible in a profile view of the shell.