THE LOWEK JAW. 



39 



In the present state of knowledge of the Dimcerata, tliis first lower 

 premolar may be regarded as a distinctive feature of the genus 

 Uintafherium, the type specimen of wliich, unfortunately, is too 

 fragmentary for a complete identification of its principal characters. 



f^h — ^' ^ 



---STC^jVn 



FiGnRE 41. — Lower jaw of Uinlatherium segne. Marsh (No. 1194); seen from the left. 

 Figure 42. — The same jaiv; seen from above. 



a. angle ; c. alveole of canine ; cr. corouoid ]irocess ; cd. condyle ; d. diastema ; p. process for protection 



of tusk ; pm. alveole of premolar 



Both figures are one-fourth natural size. 



