SECOND SERIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



CONSERVATOR OF THE CONCHOLOQIOAL SECTION OF THB ACADEMY OF NATURAL 



SCIENCES OF PHILADELPHIA. 



VOL. I. 



TESTACELLID^E, OLEACINID^E, STREPTAXID J3, HELICOIDEA, 

 VITRINID^E, LIMACID^E, ARIONID^E. 





PHILADELPHIA: 



PUBLISHED BY THE AUTHOR, 



Academy of Natural Sciences, Cor. 19th 4f Race Sts. 



1885. 





