SIMUDE 733 
important characters of that of the whole series of trunk-vertebre.? 
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 
Fig. 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 vertebre, and has thus given rise to the statement that the number of 
vertebre in the Orang is the same as in Man. 
