ORDER QUADRUMANA. 207 



We may divide the monkeys into two principal 

 sub-genera, viz., 1. monkeys of the old world, and, 2. 

 monkeys of the new, which will naturally be found 

 to form numerous groups. 



Monkeys proper to the Old World. 



All these have the same number of cheek teeth as 

 ourselves, but in other respects they differ from one 

 another by certain characters, which have given rise 

 to the following sub-divisions. 



Apes, Orangs, or Wild Men, (Simia, Erxleben, Pithecus, 

 Geoffr. Illiger.^) 



The muzzle in these animals is by no means promi- 

 nent, the facial angle inclining about 65°. These 

 are the only quadrumana in which the hyoid bone, 

 the liver, and the caecum exactly resemble those 

 parts in man. Some have the arms long enough to 

 touch the ground when they are in an erect posture. 



The Orang Outang, (Simia Satyrus, Linn.J 



The average height of this species is from three 

 to four feet. The body is covered with coarse 

 red hairs. The forehead equals in height one- 

 half of the rest of the visage. The face is bluish. 

 There are neither pouches in the cheeks, nor cal- 

 losities on the buttocks. The hinder thumbs are 



Q 2 



