STRUCTURAL 



SYSTEMATIC 



CONCHOLOGY: 



AN INTRODUCTION TO THE STUDY OF THE 



MOLLUSCi?L. 



VOL. II. 



By GEORGE W. TRYON, Jr. 



conskrvatok of the conchological section op thk academv of nattjkal. 

 Sciences of Philadelphia. 



PHILADELPHIA : 

 PUBLISHED BY THE AUTHOR, 



Academy of Natural Sciences, Cor. 19th & Race Sts. 



1883. 



C«p;right, 18S3, by Georg* W. Tryon, Jr. 



