356 Contribvtions to the 



much larger, arising from the eight ribs below the third, 

 thence narrowing to its insertion into the lower angle and 

 part of the posterior border of the scapula, without any 

 tendon. I did not see that the intervening thin portion 

 was anything more than a thin membrane. 



Subclavius. I am quite sure that it was present, but 

 did not note its connections. Mr. Moore thinks he saw it 

 on the right side of this specimen. It is generally pres- 

 ent in Quadrumana, and larger than in man, in accord- 

 ance with the greater mobility of the shoulder. 



Costo-coracoid ligament. Connects the cartilage of first 

 rib near the sternum with the coracoid process. Duvernoy 

 thinks that this takes the place of the Subclavius in Go- 

 rilla ; but they both existed in this Chimpanzee. 



Coraco-brachialis. Does not seem to reach the coracoid 

 process at all, except through the tendon of the short head 

 of the Biceps, to which, and to the upper part of the muscle 

 itself, its fleshy fibres are attached ; its insertion, I think, 

 was not more than one half an inch long, one third down 

 the humerus. In Prof. Wyman's Gorilla this attachment 

 was from the surgical neck as low down as the middle of 

 the humerus. 



Before describing the muscles employed in climbing, let 

 us first consider how far this principal mode of locomotion 

 of the Quadrumana dill'ers from that of man. 

 . The Ciuadrumana are all more or less perfectly adapted 

 for climbing ; but as those of the old world form two 

 groups, — the Anthropoids, including the Chimpanzees, 

 Orangs, and Gibbons, with very long and powerful arms 

 and short legs, fitting them well for climbing, but poorly 

 for walking; and the Baboons and Monkeys, (Cynocephali, 

 Macaci, &c.) whose limbs are of nearly equal length and 

 power, and who climb or walk on all fours with about the 

 same facility, — so in the new world are two correspond- 

 ing groups, the Howling-Monkeys, the Ateles, &c., with a 



