68 



ON THE EXTINCT MAMMALIA OF 



Thickness of crown of lower canine, 



Width of space occupied by upper incisors, 



Width of space occupied by lower " 



Length of lower jaw, partially estimated, 



Depth of loAYer jaw at condyle, partially estimated, 



" " at corouoid process, 



" " below third premolar, 



" " at side of chin, 



" " at symphysis. 



Breadth of chin, .... 

 Length of coronoid process above condyle, 

 Breadth of crown of upper first premolar. 

 Length " " " " 



Breadth " " second " 



sectorial molar, 

 tubercular " 



Length " ' 



Breadth " 



Length " ' 



Breadth " ' 



Length " ' 



Width, fore and aft, ' 



Breadth of crown of lower first premolar. 



Length " 



Breadth " 



Length " 



Breadth " 



Length " 



Breadth " 



Length of fore cusp 



Length of back cusp 



Breadth of crown of lower tubercular molar, 



Length " " " " 



iELURODON. 



-^LURODON FEROX. 



A single superior sectorial molar tooth of a large carnivorous animal, distinguished 

 by the above name, apparently indicates an extinct genus and species, different from 

 any previously characterized. The specimen was discovered by Dr. Hayden in the 



