Shell is thick, heavy, oblong and moderately inflated. Umbo is low and slightly above hinge line. Yellowish-brown epidermis, becomes darker with age; green rays may be present. Inside shell beak cavity is shallow; large pseudocardinal teeth, serrate and slightly elevated; lateral teeth blade-like, straight to slightly curved, moderately short and serrate; nacre (lining) white, rarely pink-tinged.
Similar species: The plain pocketbook’s shell is more inflated, less stout, thinner, more square (females) or rounded (males) and has a higher umbo.