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 or THE CONCHOLOGICAL SECTION OF THE ACADEMY OF 

 NATURAL SCIENCES OF PHILADELPHIA. 



Vol. XII. 



AMERICAN BULIMULID^E: NORTH AMERICAN AND ANTILLEAN DRY- 

 S, LEIOSTRACUS, ORTHALTCIN^E AND AMPHIBULIMIN^. 



// 



PHILADELPHIA: 



'ublished by the Conchological Section, 



ACADEMY OF NATURAL SCIENCES, COR. I9TH AND RACE STS. 

 1899. 



