124 THE GENERAL ANATOMY OF THE CERCOPITHECIDAE [SECT. A 



B. The Hair. The following notes are based on the descrip- 

 tions of Schwalbe 1 , who has provided admirable accounts of 

 foetal specimens of Macacus cynomolgus : 



(a) Sinus-hairs or vibrissae are found in four regions of the 

 head, viz. the supraorbital region, the lateral nasal region, and 

 near the upper and lower lips. No such hairs are found on the 

 cheeks (cf. supra, p. 65). Elevations of the skin or pads of im- 

 plantation for these hairs are not definitely present, though some 

 indications were noted. 



(b) From the region of the brows the hairs of the scalp are 

 directed from before backwards, i.e. cranio-caudally ; near the 

 vertex the stream passes into a vortex in the middle line but the 



Fig. 76. Macacus cynomolgus. Hair-tracts of the upper limb. (From 

 Schwalbe.) 



lateral parts are not interrupted (Fig. 72, with which Figs. 35, 73, 

 and 74 are to be compared). 



(c) This caudo-cranial stream is a primitive possession. It 

 continues (Fig. 75) without interruption along the back and on to 

 the tail where (with rare exceptions) it divides into symmetrical 

 lateral subdivisions. 



(d) No spirals are present on the flanks. 



(e) No spirals interrupt the hair-stream in the upper pectoral 

 region (contrast with Tarsius q.v.). 



(/) The elbow marks the convergence of two streams, one 

 (Mining from the upper arm, the second from the forearm (Fig. 76). 



1 Selenka's " Studien," Lieferung x, 1911. 



