SECOND SERIES: PULMONA 



MANUAL 



OF 



NCHOLOGY 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W, TRYON, JR. 



CONSKRVATOR OP THK CoNCHOLOGICAL SECTION OF THK ACADEMY OF NATURAL 

 SCIENCES OF PHILADELPHIA. 



VOL. II. 



ZONITID^E. 



PHILADELPHIA: 

 PUBLISHED BY THE AUTHOR, 



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



1886. 



LIBRARY 



UNIVERSITY OF CALIFORNIA 

 DAVIS 



