SECOND SERIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



CONSBRVATOR OF THB CONCHOLOGIOAL SECTION OF THK ACADEMY OP NATURAL 

 SCIENCES OF PHILADELPHIA. 



VOL. I. 



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

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



PHILADELPHIA : 

 PUBLISHED BY THE AUTHOR, 



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



1885. 



LIBRARY 



UNIVERSITY OF CALIFORNIA 



