Bullhead, Pleurobema aesopus (Green) from Wabash River, top; Dromedary mussel, Dromus dromas (Lea), from Cumberland River, middle pair; Fan-shell, Cyprogenia irrorala (Lea), from Cumberland River, lower pair. 1921. Pleurobema; Dromus; Cyprogenia; Freshwat

Freshwater and Marine Image Bank, University of Washington Libraries Digital Collections