186 



DINOCERATA. 



The position of the axis is the distinctive feature between these two 

 types of feet, and not the number of toes, as the names usually applied 

 to them indicate. In this respect, the terms Artiodactyl and Perissodactyl 

 are misleading-, and hence the names Faraxonia and Mesaxonia were 

 proposed by the author, as substitutes, to express the true axial relation. 



FiorRE 158. — Left fore foot of Rhinoceros hicornis, LinnKus. 

 FlGUKE 159. — Left hind foot of same. 



Both figures are one-eighth natural size. 



Figure IGO — Right fore foot of Brontothe-iium mgens. Marsh. 

 Figure IGl.— Right hind fool of same. 



Boih figures are one-sixtli natural size 



