"Shell nearly orbicular, equivalve, thin, semitransparent, compressed, pale pinkish yellow; auricles unequal, the posterior the smallest. Left valve very slightly convex, rayed with about nine very slightly raised ribs, about 70 slightly imbricated riblets or lirae, and numerous very close rough intervening striae; anterior auricle rather broad, rectangular, with six narrow rather prominent ridges, crossed by foliated lamellae, the interstices being peculiarly corrugated; posterior auricle smaller, more numerously and less prominently ridged, the decussating lamellae imbricated, and the corrugation more definite and oblique; umbones acute. Right valve rather more convex, radiating ribs broader and flatter, and with concentric imbricated lamellae becoming somewhat prominent towards the margin; anterior auricle strongly imbricated, the lamellae being irregularly raised on the upper margin; posterior auricle with ridges closely armed with nodules or short blunt spines. Interior of the valves suffused with golden orange colour. Ligamentary pit small, triangular." (fide G. B. Sowerby III, 1904) Size: Normal adult size range is 25 to 35 mm.

Known from southwestern coast of South Africa.
Habitat: Sublittoral zone to deep water, on gravelly bottoms.