Cjiap. XVIII. 



DEVELOPMENT OF HAIR. 



283 



disappears in some of tlie domestic breeds of the com- 

 mon goat ; and neither sex of tlie Hemitragus has a 

 beard. In the ibex the beard is not developed during 

 the summer, and is so small at other seasons that it 

 mav be called riidiinentarv.^^ AA'ith some monkeys the 

 beard is confined to the male, as in the Orang, or is 



Fi-. 66 



Pithecia Satanas, male (fruin Brehm). 



much larger in the male than in the female, as in the 

 Mycetes caraija and Pithecia satanus (fig. QQ), So it is 

 \vith the whiskers of some species of Macacus/^ and, as 

 we have seen, with the manes of some species of baboons. 



^^ See Dr. Gray's ' Cat. of Mammalia in British Museum,' part iii. 

 1852, p. 144. 



'' Rengger, ' Stiugetliiere,' &c., s. 14; Desmarest, * Mammalogie,' 

 p. 60. 



