ON THE UAKARI MONKEYS. Ill 



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 1| inch from the middle line, just on a line between the ends of 

 the axillary folds *, about 1-25 inch from the apex of the axilla. 



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

 mark 4| inches from the pubic symphysis. The anus is a transverse 

 slit; the vulva, which is provided with a short clitoris, is vertical. The P. Z.S. 1880, 

 perinaeum measures about -35 of an inch. The ischiatic prominences, p> 

 perinaeum, and root of the tail are covered by greyish skin forming a 

 rhomboidal space, about 1*5 inch broad and high ; under the tail there is 

 a slight hollow, with a raised fold of skin at each side. 



The skin of the cheeks is thin and smooth throughout inside. The 

 hard palate has about ten slightly curved (lunate) ridges on each side, 

 best marked anteriorly, and not meeting mesially. The first two lie 

 between the canines, the last on the level of the last molar. The more 

 posterior ones are faint and irregular, and straighter ; the two most 

 anterior the strongest and most curved. In front of the most anterior 

 are two small slits, one on each side of the centre, directed antero- 

 posteriorly, and lying in a line with the inner margin of the median 

 incisor. 



The tongue is elongate and parallel-sided, being bluntly squared off at 

 the tip. In front of the palato-glossal folds, which are well developed, 

 it is covered, above and on the sides, with filiform papillae ; below it is 

 smooth. The fungiform papillae are numerous, and distributed over the 

 sides and tip of the tongue in front of the circumvallate papillae ; of 

 these there are four, arranged in the usual reversed ^-shape, the extra 

 one lying on the right side. In Pithecia satanas I found three only. 

 There is a " Mayer's organ " of about 15 slits, in the usual position 

 in front of the palato-glossal folds. There is a frenum linguae, and a 

 smooth, fleshy, well-developed sublingua, bifid apically, with the duct of 

 the submaxillary glands opening on the two papillae behind this. The 

 uvula is blunt and feebly developed. All the salivary glands are well 

 developed. The parotid is large, measuring 2 inches across at its 

 greatest development ; it occupies part of the "anterior triangle," sending 

 a lobe up and behind the auditory meatus ; it then runs forward over 

 the masseter muscle, the superior border coinciding with the zygoma, as 

 far as its anterior border, where on one side there is a small down- 

 wardly directed lobule developed. Below it extends far into the fossa 

 behind the jaw, and is in contact beneath with the submaxillary. The 

 duct opens opposite the last premolar. 



* In a female of Mycetes seniculus, examined some years ago by Prof. Garrod and 

 myself, the mammae were found to be situated in the axillae. 



