A 



MONOGRAPH 



OF THE 



TERRESTRIAL lOLLUSCA 



INHABITING THE 



LTJSriTED STATES. 



W*ith Illustrations of^ all the Species, 



BY GEORGE W. TRYON, JR., 



Editor of The American Journal of Concliology ; Member of tlie Academy of Nutural Scieiici^ 



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 Zonlogiachen-botanischpn 



Gesellschaft in Wien, etc. 



PHILADELPHIA : 



Published bt the Atjthok, 625 Market Street. 



new york: london: 



BATLLTERt BROTHERS No. 520 Broadway. Tbubser & Co., No. 60 Paternoster Row. 



}>AEIS MADRID : 



J B Baili^iere et Fils, Rue Hautefeuille. C. BAtLLY-BAlLLiEEE, Calle del Principe. 



BERLIN: 

 A3HER & Co., No. 20 Unter d. Linden. 



