

SECOND SERIES: PULMONATA. 



MAN UAL 



OF 



OGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W, TRYQN, JR. 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY ov 

 NATURAL SCIENCES OP PHILADELPHIA. 



Vol. IV. 



HELICID/E: Vol. II. 



PHILADELPHIA: 

 Published by the Author, 



ACADEMY OF NATURAL SCIENCES. COR. I9TH & RACE STS. 



1888. 



9 



