192 THE DESCENT OF MAX. Part I. 



wards, and the lower eyelids wrinkled. The external 

 ears are curiously alike. In man the nose is much 

 more prominent than in most monkeys ; but we may 

 trace the commencement of an aquiline curvature in 

 the nose of the Hoolock Gibbon ; and this in the Sem- 

 nopitheeus nasica is carried to a ridiculous extreme. 



The faces of many monkeys are ornamented with 

 beards, whiskers, or moustaches. The hair on the head 

 grows to a great length in some species of Semno- 

 pithecus ; 6 and in the Bonnet monkey (Macacus 

 radiatiis) it radiates from a point on the crown, with a 

 parting down the middle, as in man. It is commonly 

 said that the forehead gives to man his noble and intel- 

 lectual appearance ; but the thick hair on the head of 

 the Bonnet monkey terminates abruptly downwards, 

 and is succeeded by such short and fine hair, or down, 

 that at a little distance the forehead, with the exception 

 of the eyebrows, appears quite naked. It has been 

 erroneously asserted that eyebrows are not present in 

 any monkey. In the species just named the degree of 

 nakedness of the forehead differs in different individuals; 

 and Eschricht states 7 that in our children the limit 

 between the hairy scalp and the naked forehead is 

 sometimes not well defined ; so that here we seem to 

 have a trifling case of reversion to a progenitor, in whom 

 the forehead had not as yet become quite naked. 



It is well known that the hair on our arms tends to 

 converge from above and below to a point at the elbow. 

 This curious arrangement, so unlike that in most of the 

 lower mammals, is common to the gorilla, chimpanzee, 

 orang, some species of Hylobates, and even to some few 

 American monkeys. But in Hylobates agUis the hair 



6 Isid. Geoffroy, ' Hist. Nat. Gen.' torn. ii. 1859, p. 217. 



7 " Ueher die Richtung der Haare," &c, Miillei-'s ' Arcliiv fur Anat. 

 und Phys.' 1837, s. 51. 



