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Monkey-face, Quadrula melanevra (Rafinesque),a; maple-leaf, Quadrula lachrymosa (Lea), b; maple-leaf, Quadrula fragosa (Conrad) from Ohio River, c; pig-toe, Quadrula plena (Lea), from Cumberland River, d; Rabbit's foot, Quadrula cylindrica (Say), from White River, Ark,

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