Shell is moderately thick, elongate, anterior end rounded with a blunt posterior end (males) or inflated and squared-off posterior end (females). Umbo is slightly raised above hinge line. Epidermis is smooth, shiny yellow to brownish-yellow, becomes dark chestnut in some older adults; usually distinct green rays. Inside shell beak cavity is moderately deep; pseudocardinal teeth thin to triangular and roughened; lateral teeth blade-like, moderately long and straight; nacre (lining) bluish-white, iridescent posteriorly.
Similar species: Plain pocketbook is more inflated and has a higher umbo. The mucket’s shell is more oval and compressed.