326 BIOGRAPHICAL INDEX 



SwAiNSON, William. An English naturalist, 

 author of "Exotic Conchology," published in Lon- 

 don, 1821-1835. 



Tryon, Geo. W. Jr., 1838-1888. An American 

 conchologist, author of the first tew volumes of the 

 ^'Manual of Conchology," and of other important 

 works. He lived in Philadelphia, and was a 

 prominent member of the Academy of Natural 

 Sciences. 



Valenciennes, (VaL). A French naturalist, 

 living during the first half of the last century. 



Wood, William. A London author and Natural 

 History book-seller. He published many books on 

 shells, from 1818 onward. 



