€hap. XYIII. 
DEVELOPMENT OF HAIR. 
283 
disappears in some of the domestic breeds of the com- 
mon goat ; and neither sex of the Hemitragus has a 
beard. In the ibex the beard is not developed during 
the summer, and is so small at other seasons that it 
may be called rudimentary.^® With some monkeys the 
beard is confined to the male, as in the Orang, or is 
Fig. 66. Pithecia Satanas, male (from Brehm). 
much larger in the male than in the female, as in the 
Mycetes caraya and Pithecia satanas (fig. 66). So it is 
with the wliiskers 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. IM. 
Rengger, ^ Saugethicre,’ &c., s. 14; Desmarest, ‘ Mammalogie,’ p. 
■ 66 . 
