MANUAL 



OP 



Nr\ r\ r\ n T7 

 C H L G Y; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



CONSERVATOR or THE C<>NCHOLOC;ICAI, SECTION OF THE ACADEMY OF NATURAL SCIENCES 

 OF PHILADELPHIA. 



VOL. IX. 



SOLARIID^E, lANTHINID^, TRICHOTROPID^E, SCALARIID^E, 

 CERITHIID.E, RISSOID.E, LITTORINID^E. 



PHILADELPHIA: 

 Published by tlie Author, 



ACADEMY OF NATURAL SCIENCES, COR. IQTH a RACE STS. 



188T. 

 LIBRARY 



UNIVERSITY OF CALIFORNIA 

 DAVIS 



