MANUAL 



OP 



ONCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W, TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRY. 



. XII. 



STOMATELLID^E, SCISSURELLID/E, PLEUROTOMARIID^, HALIO- 



TID/E, SCUTELLINID^E, ADDISONIID^, COCCULINIIJLE, 



FISSURELIJD/E. 



PHILADELPHIA: 

 Published by the Conehologieal Section, 



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



1890. 



LIBRARY 



UNIVERSITY OF CALIFORNIA 

 DAVIS 



