SECOND SERIES: PULMONATA. 



MANUAL 



OP 



NCHOLOGY; 



Ht r \ 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W, TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRY, 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY OF 

 NATURAL SCIENCES OF PHILADELPHIA. 



VOL. 



HELICID^ : Vol. III. 



PHILADELPHIA: 

 Published by the Conehological Section, 



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



1889. 



