

SECOND SERIES: PULMONATA. 



MANUAL 



OF 



J 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



*> 



< 



BY GEORGE W. TRYON, JR. 



C* 



CONTINUED BY 



HENRY A. PILSBRY. 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY OP 

 NATUKAL SCIENCES OF PHILADELPHIA. 



Vol. VIII. 



:, Vol. VI. 



PHILADELPHIA : 

 Published by the Conehologieal Section, 



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



1892. 



