CHAP. IV] THE GENERAL ANATOMY OF GORILLA 161 



the Simiidae towards the stage reached by Man himself. And 

 this must be recognized on morphological grounds, even though 

 we agree with Mr Pocock 1 in admitting that in fact the Chim- 

 panzee actually moves (in bipedal fashion) more rapidly and freely 

 than the Gorilla. Bulk and mass have to be considered here, and 

 it is perhaps not flippant to suggest that the smaller and weaker 

 Chimpanzee like the Hylobates (which is the smallest anthropoid 

 ape and yet the best " bipedal " performer of all) is by the greater 

 development of these powers compensated for the brute strength 

 which allows the Gorilla to move in more leisurely fashion. 



B. Hair. The disposition of hair-tracts may be described 

 briefly as follows (young specimens in the Cambridge Collection 

 providing the materials for study). 



(a) Sinus hairs. In young individuals, these are found 

 definitely in four regions of the face and thus constitute the 

 supra-orbital, infra-nasal, superior and inferior labial groups. I am 

 unable to assure myself of their presence on the cheeks, though 

 I suspect this. Nor can I see that the regions of implantation 

 are distinguished either by elevations of the epidermis or by modi- 

 fied pigmentation (as in the Lemurs). 



(b) From the brows the scalp hairs stream backwards cranio- 

 caudally. At the temples the stream turns downwards, and sweeps 

 past the ear in two subdivisions — the anterior of these passing in 

 front of the ear and turning somewhat forwards at the angle of 

 the jaw. The hinder stream is directed downwards on the neck. 



(c) No vortex was observed in the nuchal region nor over 

 the seventh cervical spine. 



(d) Lateral vortices are not present on the abdominal wall. 



(e) Anteriorly, such vortices are seen in two situations, viz. 

 (i) over the clavicle as in Tarsius and in Man, (ii) in the inguinal 

 region near the anterior superior spine of the ilium. 



(/) Hair- tracts converge to the elbow, as in many of the 

 Cercopithecidae, and in all the Simiidae save in certain examples 

 of Hylobates agilis. 



1 P. Z. S., 1905, Vol. ii. p. 178. 

 D. H. 11 



