248 



THE ARM AND FORE- ARM. 



[chap. 



extends far down on the bone, especially in the Bears. 

 The inner condyle is prominent. The anconeal fossa is 

 deep. A supracondylar foramen exists in the Felidce, and in 

 most of the Viverridce, Mustelidcz, and Procyonidce, but not 

 in the Canidce, Hycenidce, or Ursidce. 



Fig. 82. 



Fig. 83. 



Fig. 



Anterior aspect of the bones forming the right elbow-joint of Man (Fig. 82) ; of tli 

 Dog (Fig. 83); of the Red Deer (Fig. 84) ; all ^. k humerus; r radius; n ulna. 



The radius differs from that of Man, inasmuch as its 

 upper end is broad, flattened, and extends further across the 

 front of the humeral articular surface, forming part of the 

 hinge (see Fig. 83) ; and, although it is never ankylosed with 

 the ulna, scarcely any appreciable amount of movement is 

 allowed between them. The ulna has a large compressed 

 olecranon, and a shaft gradually tapering to the lower 

 extremity. 



In the Pinnipedia the bones of the anterior limb are very 

 short and stout. The humerus has a remarkably prominent 

 deltoid ridge, and usually no supracondylar foramen, though 



