SIMIID^E 



733 



important characters of that of the whole series of trunk-vertebrae. 1 

 The hemispheres of the brain are much convoluted ; the whole 

 brain being more human-like than in any other Ape. The larynx is 

 remarkable for having a prolongation from each ventricle, which in 

 the adult become of enormous dimensions, and unite in front of 



Fio. 354. The Orang-Utan (Simia satyrus). From Mr. Wolf's sketch at the 

 Zoological Gardens. 



the trachea to form one large sac extending downwards between 

 the muscles to the axilla. 



The skull of the Orang (Fig. 353) is characterised by its highly 

 vaulted cranial portion, which is comparatively short (brachy- 

 cephalic). The sagittal crest is well developed on the vertex, and 

 has a highly convex contour; the superciliary ridges are but 

 moderately developed, and do not stand out in the prominent 

 manner so characteristic of the Gorilla. The aperture of the nares 

 in the skull is more pear-shaped than in the two following genera. 



The canines of the male Orang attain a great development; 



1 One skeleton in the Museum of the Royal College of Surgeons has five 

 lumbar vertebra 1 , and has thus given rise to the statement that the number of 

 vertebra in the Orang is the same as in Man. 



