MANUAL 



OF 



ONCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W, TRYON, JR. 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THB ACADEMY OF NATURAL 

 SCIENCES OF PHILADELPHIA. 



j& ^ 



&-- 



VOL. VII. 



; ^T;,, Li* " ' >4 :>> 

 TEREBKID^E, CANCELLARTID^, STROMBiD^E, CYPR^ID^E, 



OVULID^E, CASSIDID^E, DOLIIDJE. 



PHILADELPHIA: 

 Published by the Author, 



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



1885. 



