Tool 

 Mollusca 

 T 



MAN UAL 



OF 



CONCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPEC! 



BY GEORGE W, TRYON, JR. 



i.OUir.M, SKI l'l(>\ OK THK ACADEMY 

 ..'liS UK PHILADELPHIA. 



VOL. I. 



CEPHALOPODA. 



PHILADELPHIA: 

 ish*'*! 1 > y t h. e Author. 



ACADIMY or NATURAL SciLNcis. COH. I9rn * RACE STS. 



