SECOND SERIES: PULMONATA. 



MAN UAL 



OF 



I 



STRUCTURAL AND SYSTEMATIC. 



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. V. 



HELICID^ : Vol. III. 



PHILADELPHIA: 

 Published by the Conchologieal Section, 



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



1889. 



