SKI; IKS: ITI.MONATA. 



MANUAL 



CONCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



FOUNDED BY 



GEORGE W. TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRY, Sc.D., 



KKVATOR OF THE CONCHOLOGICAL SECTION OF THE A( ADKMY OY 

 NATURAL SCIENCES OF PHILADELPHIA. 



fart 



PHILADELPHIA : 



Published by the Conchological Section 



ACADEMY OF NATUKAL SCIENCES 

 OF PHILADELPHIA. 



