MANUAL 



OF 



L 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



( VT\.-K,IlVATOn OF THE CONCHOLOCilC'AI, SKCTIO.V OK THK AfADKMV OP XATVRAL 

 SOKNCKS <>F PHir-ADKMMUA. 



YOU LI I. 



TRlTONIDjE, FUSION, BUCC1NIDA 



PHILADELPHIA: 

 Published, by tlio Antlior, 



ACADEMY OF NATURAL SCIENCES. COR. IOTH & RACE CTT. 



1881. 



LIBRARY 



UNIVERSITY OF CALIFORNIA 



