ITS ANCESTORS AND RELATIONS. 



15 



any known member of the group, even the most 

 ancient. 



A B 



FIG. 1. A, diagrammatic representation of the bones 

 of the right fore-foot of an odd-toed or Perissodac- 

 tyle animal. B, of an even-toed or Artiodactyle. 

 C, the carpus or wrist, consisting of two rows of 

 bones, the upper being c, cuneiform ; I, lunar ; and 

 s, scaphoid ; the lower, u, unciform ; m, magnum ; 

 td, trapezoid, and tm, trapezium. The long bones 

 in contact with the last constitute the metacarpus ; 

 the remaining bones are the phalanges. The digits 

 or toes are numbered in order from the inner to the 

 outer side of the foot. The shaded parts of A are 

 those that are present in the horse ; in B, those that 

 are present in the ox. 



