116 



ORGANS OF SUPPORT, 



FIG. 60. 



makis, become more short and rounded in the higher quad- 

 rumana, correspond with the softer quality of their succu- 

 lent and juicy food. The ramus of the lower jaw ascends 

 higher and more abruptly, and the coronoid process is re- 

 duced in length and strength. The occipital foramen ad- 

 vances forwards on the base of the skull by the expansion 

 of the posterior region, and the occipital bone becomes con- 

 fined to the basilar aspect of the cranium. The supra-or- 

 bitary foramen is generally absent, or a mere notch, and 

 the infra-orbitary hole is commonly divided into several 

 small apertures. In the orangs the intermaxillaries anchy- 

 lose to the upper jaw-bones, and to each other in the 

 adult, as in the human 

 jaws. The general forms 

 of the bones and articu- 

 lations of the rest of the 

 skeleton are adapted for 

 the semi-erect or climb- 

 ing position of the trunk, 

 as seen in the skeleton 

 of the mona monkey, 

 cercopithecus mona, (Fig. 

 60.) The cervical, and 

 lumbar, and coccygeal 

 regions of the column 

 generally admit of free 

 and extensive motion. 

 The cervical vertebrae 

 have their spinous pro- 

 cesses simple and point- 

 ed, the dorsal vertebrae 

 nearly of the same num- 

 ber as in man, and the 

 lumbar vertebrae encreas- 

 ed in number at the ex- 

 pense of the sacrum. 

 The transverse processes 

 more directed for- 



are 



wards towards the head 

 than the human in these 

 free and moveable lumbar vertebra;. 



In the prehensile tails 



