NORTH AMERICAN CONCHOLOGY. 



417 



Page. 



202 



266 



266 



266 



266 



Strombus gigas. 



Tellina fragilis. 

 radiata. 



similis. (Amer.) 

 dubia. {Amer.) 



267 Teredo navalis. 



272 Trochus magus. 



273 Turbo corticaria. 

 275 Venus mercenaria. 

 278 Voluta pallida. 



(A T . r.) 



Gould. — Mollusca and Shells of the United States Exploring 

 Expedition (Com. Wilkes): by A. A. Gould, M. D. Boston, 

 1852. 



[The following are the American species. — W. G. B.] 



