For Terms See Fourth Page of Cover. 



MONOGRAPH 



TERRESTRIAL MOLLUSCA 



INHABITING THE 



UN^ITED STATES. 



With Illustrations of all the Species. 



BY GEORGE W. TRYON, JR., 



Editor of the American Journal of Conchology ; 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 Aca- 

 demy of Natural Sciences, the Zoologischen-botan- 

 ischen Gesellschaft in Wien, etc. 



PHILADELPHIA : 



Published by the Atjthok, 625 Market Stbeet. 



new york: london 



Baillikre Brotheks, No. 620' Broadway. Trobser & Co., No. 60 Paternoster Row. 



PARIS: MADRID: 



J. B. BAII.LIERE ET FlLS, Rue Hautefenille. C. Bailit-Baillieee, Calle del Principe. 



BERLIN : 

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



