/. /< 



SECOND SERIES: PULMONATA. 



MANUAL 



OF 



J 



STRUCTURAL AND SYSTEMATIC. 



WITH ^LUSTRATIONS OE 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^E, Vol. V. 



PHILADELPHIA : 

 Published by the Conehologieal Section; 



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



1891. 



