tU STRUCTURAL 



\\{^0^ AND 



v.i 



jVvU- SYSTEMATIC 



CONCHOLOGY: 



AN INTRODUCTION TO THE STUDY OF THE 



MOLLUSOi^. 



VO L. I. 



By GEORGE W. TRYON. Jr. 



Conservator of the Conchological Section of the Academy of Natural 

 Sciences of Philadelphia. 



^ '/ft 





PUBLISHED BY THE AUTHOR, 



Academy of Natural Sciences, Cor. 19th k Kace Sts. 



1882. 



Copyright, XVii, ij Q«orge W. Trjoo, Jr, 



