74 



ANTHROPOID APES. 



Fig. 20. — Skeleton of I lie 

 forearm and hand of the 

 Central African bani- 

 chiinpanzee. a. Ulna, b, 

 liadiiis. c. Scaphoid bone, 

 rf. Semi-lunar bone, e, 

 Cuneiform bone. /, Pisi- 

 form bone. (7, Trapezium. 

 /(, 0.< magnum, j, 'I'ra- 

 pezoid. /r, IJnciform bone. 

 I. I'lialanpe-s of thumb, m. 

 Metacarpal bones. n, 

 I'halaiiges. 



this compression is greater than in 

 man and in the gorilla. The four 

 lumbar vertebrae of the chimpanzee 

 are furnished with long, thin, rib- 

 like transverse processes. The so- 

 called mammillary processes of 

 the final vertebra are strongly de- 

 veloped in the male. The inter- 

 vertebral foramina are small, as 

 they are also in the gorilla and 

 orang-utan. The thirteen ribs of 

 the chimpanzee remind us of the 

 human structure. The collar-bone 

 is slightly curved, as in the gorilla. 

 There is a marked difference 

 between the sexes in the struc- 

 ture of the scapula which is 

 broad and three-sided in the male, 

 small and leaf-shaped in the fe- 

 male. 



The humeri have slender shafts, 

 with well-developed condyles and 

 ridges. The bones of the forearm 

 are much curved, so that the in- 

 terval between them is, as in the 

 gorilla, somewhat wide. From the 

 wrist to the final phalanges the 

 hand is more slender than in the 

 gorilla. 



The pelvis in this species of ape 

 has high, narrow ilia, spreading 

 in their upper parts, and pro- 



