M. 



Width frontal bone near front of fontanelle 0.012 



Thickness at do . . 004 



" " casque 005 



Width spine. .005 



Depth " 009 



Rhineostes smithii. Cope. 

 Indicated by a dorsal spine of an individual of smaller size than the 

 type of the last named. It is less rugose, and more firmly striate, and 

 possesses a row of short reverted spines in its posterior groove. The 

 anterior edge is furnished with a finely serrate keel, which has a groove 

 on each side at the base. The section is oval, the posterior face not being 

 flattened as in the last species. Anterior-posterior diameter near middle 

 M. .005 ; at base .006 ; width behind above base .006. 



Named for my respected friend, Daniel B. Smith, of Germantown ; 

 many years Principal of Haverford College, and a student and lover of the 

 Natural Sciences. 



August 20th, 1872 



