MANUAL 



OF 



NCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



Co.\. ;:::V.\TO:I OTf ". : : ( '->x .-rior-ooTc .YT, STATION- OP Tin: ACADF.MY OB- NATURAL 



. v. 



MARGINELLID, OLIVID^E, COLUMBELLID^. 



PHILADELPHIA: 

 Published by the Author, 



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



1883. 



LIBRARY 



OF CALIFORNIA 

 DAVIS 



