Plain Pocketbook (Pocketbook)
Shell is large, moderately thick, inflated, rounded to oval shell with a blunt posterior end (males) or squared-off posterior end (females). Umbo is broad, raised above hinge line. Epidermis smooth, yellow or tan to yellowish-green with dark green rays. Inside shell beak cavity is deep; pseudocardinal teeth large, heavy and serrate; lateral teeth high, blade-like and short; nacre (lining) white, occasionally pink or salmon.
Similar species: Fatmucket’s shell is not as inflated and has a lower umbo. The mucket’s shell is more oval and compressed.