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MONOGRAPH 



, ■ ■/ 



OF THE 



TERRESTRIAL MOLLUSCA 



INHABrraN^^ TH« 



TTN^ITED STATES. 



fW*iih Illustrations of alt the Species. 



BY GEORGE W. TRYON, JR., 



Editor of The American Journal of C()nchoIogy ; Member of the Academy of Natural Sciences 



of Philadelphia ; Corresponding Member of the Boston Society of Natural History, 



the Lyceum of Natural History of New York, the California Academy 



of Natural Sciences, the Zoologischea-botanischen 



Gesellschaft in Wien, etc. 



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