Sl'XJOND SERIES: PULMONATA. 



MANUAL 



OF 



OLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W, TRYON, JR. 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY OF 

 NATURAL SCIENCES OF PHILADELPHIA. 



Vol. IV. 



: Vol. II. 



PHILADELPHIA: 

 Published by the Author, 



ICIENCES, COR. I9TH &. RACE STS. 



1888. 



LIBRARY 



UNIVERSITY OF CALIFORNIA 



