MAN AND APES. 27 



from bough to bough with great rapidity by 

 means of their enormously long arms, which 

 reach down to the ankle-joint when the body 

 is erect. 



The Siamang inhabits Sumatra, and goes 

 about in troops, which morning and evening 

 make the woods re-echo with their sonorous 

 cries. 



The white-handed or Lar Gibbon (Fig. 5) 

 comes from Malacca and Siam. It was 

 described and figured by Buffon. 



The Silvery Gibbon, or Wouwou of Camper 

 (Fig. 6) is an inhabitant of Java. 



The Gibbons differ from the higher Simiince 

 in that they have the small pads of naked 

 callous skin upon which the body rests when 

 in a sitting attitude. These naked spaces are 

 called ischial* callosities. 



The second sub-family embraces a num- 

 ber of large long-tailed species of monkeys, 



* So called because they cover the lower part of that 

 portion of the haunch-bone which is called the ischium. 

 (Fig. 51, a 7). 



