MANUAL 



OF 



CHOLOG.Y; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



:I:V\TOU of . roLor.iCAT., Snrnox OP Tir.". AOADKMY OF N .\Tru.\L 



SCIENCK3 Hi- 1 rfllLADKI.lMll.v. 



VOT,. r\'. 

 NASSID^l, TURBINELLID^:, VOLUTID^l, MITRID.^. 



PHILADELPHIA: 



licd by 



ACADEMY CF NATunAi. SCIENCES, COR. IGTH & RAC: 

 2. 



LIBRARY 



UNIVERSITY OF CALIFORNIA 

 DAVIS 



