632 MR. W. A. FORBES ON THE UAKARI MONKEYS. [NoV. 30, 



measure over 4 inches ; and those on the limhs are from S-Sj inches in 

 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 bacliwards 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) is 3*5 inches, the 

 breadtli across the knuckles about 1*35. The fourth digit is the 

 longest (2' 15), being 0" 1.5 inch longer than the third ; the second 

 and fifth are about equal (1'75). The thumb is, as in other Cebidae, 

 directed in the same plane as the remaining digits ; it measures ri5 

 inch in length, reaching slightly beyond the first phalanx of the second 

 digit. The interdigital membrane is slight. The nails are com- 

 pressed, and rather elongated, particularly on the fifth digit ; that 

 of the pollexis shorter, and more compressed and " nail "-like. The 

 palmar surface is nude; the dorsal sparingly hairy, the hairs ex- 

 tending onto the fingers. 



The greatest length of the nude plantar surface is 5-25 inclies ; its 

 breadth, at the base of the hallux, is l*.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''J5 inches long. The 

 hallux measures 1''25 inch, and has a broad oval nail, slightly com- 

 pressed ; the nails of the other digits are rnucli compressed, slightly 

 curved, and rather claw-like. The inferior aspects of the hand 

 and feet, of the natural size, are represented in the accompanyin"- 

 figures (fig. 1, p. G30, & fig. 2, p. 631)-. ° 



The axillary folds are well marked ; and the axillae are quite nude, 

 as is a space continuous with them on the inner aspect of the arm 

 for nearly one third its length. The teats, two in number, are 

 situated about \i inch from tlie middle line, just on a line between the 

 ends of the axillary folds ^ about 1*2.") inch from the apex of the 

 axilla. 



The umbilicus is represented by a slight, scarcely perceptible slit- 

 like mark 4g inches from the pubic symphysis. The anus is a 

 transverse slit ; the vulva, which is provided with a short clitoris, is 



^ One of the characters of Dr. Gray's genus " Ouulcaria" is "Fur short 

 silky"! (Cat. Monk. p. C.l). 



- 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 alwars 

 returned to. I am not, however, jirepared to say that it is natural, as I never 

 observed it in the living animal. The other digits sliuwed no trace of it. 



3, In a female of Mycctcs scniculus, examined some years ago by Prof. 

 Grarrod and myself, the mammre were found to be situated in the axilla\ 



