

SECOND SERIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL IND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



' BY GEORGE , TRYON, JR. 



CONTINUED BY 





HENRY A. PILSBRY, Sc. D., 



' / 



CONSERVATOR OP THE CONCHOLOGICAL SECTION OF THE ACADEMY OT"- 



NATURAL SCIENCES OF PHILADELPHIA. 



Vol. XII. 



AMERICAN BULIMULID.E: NORTH AMERICAN AND ANTILLEAN DRY- 

 M^EUS, LEIOSTRACUS, ORTHALICIN.E AND AMPHIBULIMIN^E. 



PHILADELPHIA: 

 Published by the Conchological Section, 



ACADEMY OF NATURAL SCIENCES, COR. IpTH AND KACE STS. 



1899. 



