MANUAL 



OF 



NCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



CONSERVATOR OF THK CONCHOLOGICAL SECTION OF THE ACADEMY OF NATURAL 

 SCIENCES OF PHILADELPHIA. 



VOL. I. 



CEPHALOPODA. 



PHILADELPH IA: 

 Published by the Author, 



ACADEMY or NATURAL SCIENCES, COR. I9TH & RACE STS. 



1879. 



LIBRARY 



UNIVERSITY OF CALIFORNIA 

 DAVIS 



