MANUAL 



OF 



CONCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W.^RYOW JR. 



CONTINUATION BY yf 



HENRY A. PILSBRY, 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY OF 

 NATURAL SCIENCES OF PHILADELPHIA. 



Vol. XVI. 



PHILINID^E, GASTROPTERID^, AGLAJID^), APLYSIID^E, 

 OXYNoEID^l, RUNCINIDyE, UMBRACULID^, 



yN PLEUROBRANCHID^:. 



PHILADELPHIA : 

 ^Published by Conchological Section 



ACADEMY OF NATURAL SCIENCES, 

 OF PHILADELPHIA. 



1895-6. 



