68 



ramus, comprising the part opposed to the upper canine, from 

 the dental canal downwards. The jaw at this place has a large 

 downward-projecting process, very similar to that figured by 

 Marsh in his plate of Dinoceras laticeps. This process curves 

 slightly outward, and has its external side convex in both 

 directions, and its internal side convex fore and aft, concave 

 from above downwards. The posterior mental foramen, 

 which is the only one preserved in our specimen, corresponds 

 in size and position with Dinoceras laticeps. The only dif- 

 ference between the two is a very slight one : in D. the curve 

 of the posterior margin of the process is convex ; in Uinta- 

 therium it is concave ; the angle which the process makes 

 with the jaw is also greater. 



Cranial Measurements. 



M. 



Length of bony palate -227 



Length of head along the top 743 



Length of nasals -398 



Breadth at nasal tuberosities -123 



Distance between median projections 385 



Breadth of head posterior to median projections 189 



Breadth of head before posterior projections -228 



Breadth of head behind posterior projections -312 



Distance between extremities of posterior projections -462 



Length of nasals to ridge between median projections 234 



Length from ridge between median to ridge between posterior 



projections -374 



Length of zygomatic arch (straight) ; -285 



Length from angle of nares to end of nasals -162 



Length from angle of nares to end of premaxillaries ,. . . . -114 



Width between tips of premaxillaries -053 



Circumference of median projection at top -203 



Circumference of posterior projection at top 329 



Height of median projections from ridge between them -174 



Height of posterior projections from ridge between them 239 



Length of nasals anterior to nasal tuberosities -0415 



Teeth. These are peculiar for their small size compared 

 with the bulk of the animal ; for their slender fangs, and for 

 the distance through which these are exposed. 



Upper Jaw. Formula : I. #, C. |, Pm. f, M. f. 



Canines. The sockets of these teeth have been already 

 described : the fangs are very long, somewhat longer than the 

 crown, and the teeth apparently grew from permanent pulps. 



