THE AGILE GIBBON. 
81 
is difficult to obtain.” “ The word Yuen is given to them from their love of climbing and their wild 
disposition.” 
In Central Hainan the magistrate of the district was of opinion that the Yuen had the power of 
drawing its long arm-bones into its body, and that when it drew in one it pushed out the other to 
such an extraordinary length that he believed the two bones united in the body. He used the front 
bones of the arms for chopsticks. 
THE WOW-WOW. 
A species which is called the Wow- wow, or Silvery Gibbon (Hylobates leuciscus), is perhaps mor& 
interesting to the anatomist than to the observer of the habits of animals; for nothing is known about 
THE WOOYEN APE. ( From a stuffed specimen in the British Museum.) 
their method of living. Their skull shows a decided ridge or crest along the top, which branches 
well in front into two ridges going to the front over the orbit. Moreover, the chin of the lower 
jaw is very deep, the angles slightly turned in, and the eye teeth are thin and sharp. 
THE AGILE GIBBON * 
This animal is also interesting, from having a great twist inwards of the jaw behind, and two- 
curious ridge-like crests on the head. Its name conveys the extreme agility of the animal, as observed 
in confinement. 
These Gibbons have many interesting points about them, and one of the most curious is that they 
have no air or laryngeal pouches, and yet their general anatomy, especially of the muscles of the 
throat, neck, and body, is the same as that of the Siamang, which has been noticed above to have a vast 
pouch. The brain is small, especially behind, but why it is difficult to imagine, for the Spider 
Monkey, which lives in the New World, and whose feats of agility resemble those of the Gibbons* 
# Hylobates agilis. 
