SECOND SERIES: PULMOKATA. 



MANUAL 



OF 



HOLD 



J 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



CONSERVATOR OF TUP: CONCHOLOGICAL SECTION OF THE ACADEMY OP 

 NATURAL SCIENCES OF PHILADELPHIA. 



Vol. IV. 



HELICID^E: Vol. II. 



PHILADELPHIA: 

 Published by the Author, 



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



1888. 



