MAMMALIA. 



473 



postaxial border of the cuneiform. It may be a sesamoid 

 or possibly a carpal bone. In the hind-limb the proximal 

 tarsals are always three in number, the radiale and inter- 

 medium are fused to form astragalus and the fibulare is 



Fig. 326.-— Diagram of the Typical Mammalian Fore- and 

 Hind-Limb. 





NAVICULAR 

 IMT. CUN6»B)(^f 



^-CALCAiveulK 

 'eXT.CyNfciPOfkM. 



Note fusion of fourth and fifth distalia and limited number of phalanges. 



known as the calcaneum. The centrale persists on the pre- 

 axial side as the naviculare. The distalia are the internal, 

 middle and external cuneiform and the cuboid^ the last being 

 the fourth and fifth distalia fused together. In mammals 

 the main joint of the hind-limb and foot is between the 

 crus or tibio fibula and the proximal tarsals, hence it is a 



