ORANG OUTANG. 



13 



The Bones of the Trunk. — The cervical verte- 

 brae agree in number with the human skeleton ; but 

 they form a more flat column; their spinous processes 

 overlap less ; the atlas has no spinous process, in 

 which the Orang Outang agrees with the baboon, 

 though it differs from the latter in wanting the fora- 

 mina, which pass obliquely from each side of the 

 transverse processes of the atlas, to the passage for 

 the vertebral arteries. The cervical column = 2 

 inches. The dorsal vertebrae are thirteen in num- 

 ber ; but the inferior oblique processes of the lower 

 vertebrae are only two, as in man, not four, as in the 

 baboon. In the latter animal, the two last verte- 

 brae may be said to be without transverse processes. 

 The length of the dorsal column in the Orang = 5.7 

 inches. There are only four lumbar vertebrae. The 

 intervertebral cartilages below, differ in thickness 

 from those of the upper vertebrae, more than in the 

 human body. The cartilage between the thirteenth 

 dorsal and first lumbar vertebra, measures upwards 

 of an inch in front, while those between the cervi- 

 cal vertebrae are about 0.2 inch in thickness ; but 

 the general dimensions of the cartilages of the back 

 and loins, are from 0.2. to 0.3 inch. 



The ribs are thirteen on each side ; of these eight 

 are united to the sternum by their proper cartilages, 

 and five are joined to the cartilages of the superior 

 ribs. The ribs are placed rather on the body of the 

 vetrebrae, than on the interstices between them, as 

 is also the case in the Simla Maimon. The carti- 



