518 GEOLOGICAL SURVEY OF THE TERRITORIES. 



The specific nnme of this interesting little shell is given in honor of 

 Professor Joseph Lcidy, the distinguished comparative anatomist of 

 PMladelphia, who discovered one of the specimens from which the 



description was drawn up. c.^,nfK ^f T?r»r4- 



LoadUij (Old ^,o.s'i/«>«.-Tertiary rocks twelve miles south of Foit 



Bridger, Wyoming Territory. t 



