813 



surface is deeper than it is wide : the rough surface beneath that end is not present in the 

 Chimpanzee. The supracoracoid ridge is less prominent : the acromial extremity is broader, 

 flatter, and more rounded. 



5220. The left clavicle. 



5221. The right scapula. 



It is broader in proportion to its length than in the Chimpanzee : the infraspinal surface is 

 relatively larger ; the supraspinal one is less ; but the superior costa is longer, and forms a 

 more marked angle with the contiguous part of tft base of the scapula. The suprascapular 

 notch is smaller : the spine of the scapula is less oblique and thicker ; its free rough margin, 

 especially, is much more expanded. The coracoid, though broad, contracts rather more at 

 its fixed extremity than in the Chimpanzee. The upper end of the ovate glenoid cavity is 

 narrower in Man. The subscapular fossa is broader, that surface of the scapula being more 

 concave than convex, while the reverse proportions obtain in the Chimpanzee. The rough 

 thickened border of the inferior costa is much broader and thicker. The tubercle for the 

 long head of the triceps is larger and better marked. The coracoid is more curved in pro- 

 portion to its length : it is absolutely shorter in the White varieties of the Human race. 



5222. The left scapula. 



5223. The left huruerus. 



This is more slender in proportion to its length than in the Chimpanzee, and is much 

 shorter and thinner than in the Gorilla : it equals in length the humerus of the Orang, which 

 it also resembles in the less development of the proximal tubercle and the less depth of the 

 bicipital groove, as compared with the Chimpanzee ; but it resembles the Chimpanzee's 

 humerus in the stronger deltoid ridge, which defines the antero-internal flattened surface of 

 the proximal half of the shaft ; but this surface is not so well defined on the inner side by 

 the pectoral ridge, as in the Chimpanzee. The articular head is longer vertically, forming a 

 full oval ; it is hemispheric in the Chimpanzee. The supinator ridge is less produced and less 

 sharply defined than in the Chimpanzee or Orang. The ectocondyloid tuberosity is less pro- 

 duced, and the entocondyloid one terminates more obtusely : it presents a rough flattened sur- 

 face in the Chimpanzee and Orang. The olecranal fossa is wider, but less deep and less sharply 

 defined than in the Chimpanzee. The articular surface constitutes a greater proportion of 

 the breadth of the distal extremity of the humerus than in the Chimpanzee : the trochlear 

 ridge defining the radial tuberosity from the ulnar concavity is much less developed than in 

 the Chimpanzee. The distal third of the humerus is curved more forwards, and the breadth 

 of both extremities of the bone is absolutely as well as relatively less than in the Chim- 

 panzee. 



