BULL. Uo. Bebe monz— 1S Pate VII. 
a, Monkey-face, Quadrula melanevra (Rafinesque) (p. 24); 6, maple-leaf, Quadrula lachrymosa (Lea) (p. 23); ¢, maple-leaf, Quad- 
rula fragosa (Conrad), from Ohio River (p. 24); d, pig-toe, Quadrula plena (1,ea), from Cumberland River (p. 25); e, rabbit’s 
foot, Quadrula cylindrica (Say), from White River, Ark, (p, 24). 
