MANUAL 
OF 
PEN UC OULOGY: 
STRUCTURAL AND SYSTEMATIC. 

WITH ILLUSTRATIONS OF THE SPECIES. 

eet AE \ ,4 *» 
By GEORGE W. TRYON, JR. 
CONTINUATION BY 
HENRY “A; PILSBRY, 
CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY O 

NATURAL SCIENCES OF PHILADELPHIA. 
WO lg ox Vile 
PHILINIDA, GASTROPTERID#, AGLAJID&, APLYSIIDA, 
OXYNUEIDA, RUNCINID&, UMBRACULIDA, 
PLEUROBRANCHID&, 

PHILADELPHIA : 
Published by Conchological Section 
ACADEMY OF NATURAL SCIENCES, 
OF PHILADELPHIA. 
1895-6. 
