CONCLUSION. 



173 



Another order, also, which may be termed the Amhlydactyla, passed 

 off apparently from the main ungulate stem in the Cretaceous, and became 

 extinct in the Eocene. One branch terminated in Corypliodon, in the lower 

 Eocene, and the other, represented by tlie Dinocerata, here described, came 

 to an end in the Middle Eocene. 



In figure 147, below, a diagram is given, whicli shows graphically 

 these lines of descent, and the most probable genealogy of modern 

 Ungulates. The diagram, being on a plane, can only indicate the general 

 position of these divergent lines. 



Figure 147. — Diagram to illustrate the genealogy of XjDgulate Mammals. 



A comparison of this diagram with the section on page 7 of this 

 volume will make clear the special geological horizons of each group here 

 referred to. 



The Hyracoidea are represented by the existing Hyrax, and no fossil 

 remains of the group are-known. The principal characters of the order 

 are as follows : 



