Glycymeris Reevei (296) Polished

Shell rounded-subquadrate in outline, moderately inflated, slightly inequilateral, with rounded anterior and obtusely pointed posterior margin. Umbones not very prominent, slightly opisthogyrate and in front of midline of valves. External sculpture weak, with very low, rounded radial undulations and fine grooves, crossed by numerous, small concentric marks. Periostracum conspicuous, densely set with fine and short, dark brown hair.

Colour: outside of shell brown, with irregular whitish flecks on the umbones and posterior third of valves. Posterodorsal margin often more or less tinged blackish brown. Interior white, variably tinged with purplish brown posteriorly.