THE EXTERNAL FORM OF ANTHROPOID APES. 27 



shoulders the hair is from 130 to 150 mm. long:, 

 hanging down on the upper arms and the back. In 

 the middle of the upper arm the hair is from 50 to 

 70 mm. long, growing downwards as far as the bend 

 of the elbow. At this point it generally begins to 

 grow in an upward direction. On the back of the 

 forearm it again grows downwards. In the middle 

 of the forearm on its inner side, a parting of the 

 hairs takes • place, as one portion goes in fi'ont of 

 the radius, while the other portion turns behind 

 the ulna. On the back of the wrist a tuft of 

 curved hair turns upwards ; a middle tuft goes 

 directly back ; and the lower tuft, also curved, turns 

 outwards. On the back of the hand the hairs turn 

 towards the fingers. On the breast and belly the 

 hairs are shorter and grow more sparsely. On the 

 breast their direction is as a rule upwards and out- 

 wards. On the belly they converge from the ribs 

 towards the centre and the navel. On the thighs 

 the hairs are about 160 mm. long, and here, as on 

 the lower part of the leg, they tend outwards, while 

 on the back of the foot they grow towards the toes. 

 On the back, shoulders, and on the thigh and 

 leg, the bristles are slightly curved. This quality 

 increases the general impression of shagginess and 

 fleeciness which is produced by the hairy coat of 

 these creatures. The woolly hair does not grow very 

 thick, and is not much matted. 



The colour of the hair not only differs on different 

 parts of the body, but also in different individuals. 

 On the crown of tlie head it is of a reddish brown, 

 or rarely of a decided brown or black. The hairs in 



