ORDER UNGULATA. 



1387 



Bathmodon, Ectacodon, and Manteodon ; but further observations 

 are required to show whether all of these are really distinct from 

 the type genus. 



Section C. Dinocerata. — The third section of this suborder, 

 which Professor Marsh regards as entitled to rank as a distinct sub- 

 order, is represented by the now well-known Dinocerata, which are 

 exclusively confined to the Upper or Bridger Eocene of North 

 America. These animals were ponderous brutes, nearly as bulky 

 as an Elephant, to which group they present many curious points of 

 resemblance. The skull (figs. 1261-1263) bears several large pro- 

 tuberances ; and the upper canines of the males were enormously 

 developed (recalling those of the Feline genus Macharodus), and 

 were frequently protected from injury by a descending flange de- 

 veloped from the symphysis of the mandible, as is well shown in the 

 figure of the skeleton. A peculiar and characteristic feature is the 

 total absence of upper incisors ; while another distinctive character 

 is the want of a third trochanter to the femur, which thus resembles 

 the corresponding bone of the Proboscidea. 



Family UiNTATHERiiDiE. — The whole of the members of the 



-Left lateral view of the skull of Uintatheriupi mirabile ; from the Bridger 

 Eocene of Wyoming. Much reduced. (After Marsh.) 



section may be included in this family — the equivalent of the Tino- 

 ceratidce. of Professor Marsh. The hinder upper premolars are as 

 complex as the true molars, and there is no distinct third lobe to 

 the last lower true molar ; while in the hinder cheek-teeth of the 



