CHAP. IV] THE GENERAL ANATOMY OF THE CERCOPITHECIDAE 131 



The outer lip of the bicipital groove in the humerus is very 

 prominent, the inner lip being feebly developed or absent. At 

 the lowers-end of the bone, the articular surface is not so sharply 



Unerupred----^b 

 foorh 



Fig. 82 



Fig. 83. 



Fig. 82. Mesial section of the (frozen) body of a Cynocephalous monkey (Cerco- 

 pithecidae). Note the enormous size of the jaws, and the comparatively small 

 thoracic capacity and extent. The vertebral column is much less sinuous than 

 in Man, but the anterior lumbar convexity is incipient and distinct. 



Fig. 83. Scapulae, (a) of a Cercopithecus monkey, (b) of Man. Both have been 

 reduced to a common denominator, viz. the transverse width. 



differentiated into capitellum and trochlea as in the case of Man : 

 the conformation of the capitellum, in particular, suggests that 

 flexion and extension (the characteristic movements of this joint 



9—2 



