SECOND SERIES: PULMONATA. 



MANUAL 



OF 



STRUCTURAL AND SYSTEMATIC. 



\VITII ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W, TRYON, JR. 



CONSERVATOR OP THE CONCHOLOGTCAL, SECTION OF THB ACADEMY OP NATURAL 



SCIENCES OF PHILADELPHIA. 



VOL. II. 



ZONITID^. 







PHILADELPHIA: 

 PUBLISHED BY THE AUTHOR, 



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



1886. 



