SECOND SERIES: PULMONATA. 



MANUAL 



OK 



CONCHOLOGY 



STRUCTURAL AND SYSTEMATIC. 



WITII ILLUSTRATIONS OF THE SPECIES. 



FOUNDED BY 



GEORGE W. TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRY, Sc.D., 



SPECIAL CURATOR OF THE DEPARTMENT OF MCLLUSCA, ACADEMY or 

 NATURAL SCIENCES OF PHILADELPHIA. 



VOL. XIX. 



OLEACINIDyE. FERUSSACID^E. 



PHILADELPHIA: 

 Published by the Conehological Department, 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 



1907-1908. 



