XVIII.] 



UNGULATA. 



In the UNGULATA, the femur is rather compressed, espe- 

 cially at the lower end. There is no distinct constriction 

 of the neck, separating the head from the rest of the bone. 

 The great trochanter is very large, and usually rises above 

 the level of the head. The small trochanter is not very 

 salient, and sometimes, as in the Rhinoceros (Fig. 118), is a 



FIG. 118 Anterior aspect of right femur of Rhinoceros {Rhinoceros imicornis). 

 h head ; t great trochanter ; t' third trochanter. 



mere rough ridge. The inner edge of the anterior part of 

 the inferior articular surface is very prominent. In all the 

 Perissodactyles there is a strongly marked third trochanter 

 (/'), in the form of a compressed ridge curving forwards. 

 This is entirely absent in all the known Artiodactyles. 



The fibula is subject to great variations among the different 

 members of the order. In the Rhinoceros, Tapir, Pig, and 



