110 ON THE UAKARI MONKEYS. 



P.Z.S. 1880, In general colour and texture the coat of the Uakari greatly resembles 



p ' ' that of the Orang, as was noticed by many who saw the animal alive. 



These red hairs are continued on to the limbs and tail, the hair being 



particularly long on the arms, about the shoulders (forming here a sort 



of cape over the back and shoulders), and along the posterior border of 



the thigh and leg there being a wide patagial-like expansion of skin 



behind the knee, between the thigh and lower part of the limb. Some 



P. Z. S. 1880, of the hairs on the back measure over 4 inches ; and those on the limbs 



p. 632. are rom 3_gi i nc h es j n length*. The tail is pretty uniformly covered 



with moderately long hairs, and is in no degree, in the fresh state, bushy. 



It is not flattened or bare beneath. 



On the forearms the hairs converge on the posterior margin to the 

 elbow, being directed backwards and more or less upwards as the elbow 

 is approached. On the anterior margin, however, all the hairs are 

 directed downwards and forwards, so that a parting of the hairs runs 

 down here from the elbow to the wrist. On the posterior limbs this is 

 not observable. The lower surface of the body is much less hairy than 

 above ; and there is a well-defined median parting running along it from 

 the thorax to the abdomen. 



The greatest length of the hand (fig. 1, p. 108) is 3-5 inches, the breadth 

 across the knuckles about 1*35. The fourth digit is the longest (2-15), 

 being 0-15 inch longer than the third ; the second and fifth are about 

 equal (1*75). The thumb is, as in other Cebidse, directed in the same 

 plane as the remaining digits ; it measures 1/15 inch in length, reaching 

 slightly beyond the first phalanx of the second digit. The interdigital 

 membrane is slight. The nails are compressed, and rather elongated, 

 particularly on the fifth digit ; that of the pollex is shorter, and more 

 compressed and "nail "-like. The palmar surface is nude; the dorsal 

 sparingly hairy, the hairs extending on to the fingers. 



The greatest length of the nude plantar surface is 5*25 inches ; its 

 breadth, at the base of the hallux, is 1*5 inch. The toes have about the 

 same relations as the fingers, except that the fifth is notably longer than 

 the second. The fourth is about 2-25 inches long. The hallux measures 

 1*25 inch, and has a broad oval nail, slightly compressed ; the nails of 

 the other digits are much compressed, slightly curved, and rather claw- 

 like. The inferior aspects of the hand and feet, of the natural size, 

 are represented in the accompanying figures (fig. 1, p. 108, and fig. 2, 

 p. 109)t. 



* One of the characters of Dr. Gray's genus " Ouakaria" is "Fur short, silky" ! 

 (Oat. Monk. p. 61). 



f In fig. 2 the second digit of the foot is seen to be twice bent abruptly on itself. 

 This position was constant after death, and if altered it was always returned to. I 

 am not, however, prepared to say that it is natural, as I never observed it in the living 

 animal. The other digits showed no trace of it. 



