SERIKS: PULMONATA. 



MANUAL 



OP 



J 



I 



STRUCTURAL AND SYSTEMATIC. 



"WITH ILLUSTRATIOXS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



CONTINUATION BY 



HENRY A. PILSBRY, 



CONSERVATOR OF THE CJNCHOLOGICAL SECTION AND PROFESSOR OF MALACOLC v 

 IN THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 



INDEX TO THE HELICES. 



PHILADELPHIA : 

 ^Published by Concliologioal Section 



ACADEMY OF NATURAL SCIENCES, 



OF PHILADELPHIA. 



1895. 



