78 ANATOMICAL NOTES ON MALAY APES. 



( c )__So, after I had learned what might be called their normal 



structure, I looked for variations in their anatomy, and 



these variations — their amount and kind — signify a 



great deal. 

 (d) — In the young and almost adult members I observed the 



later acquired stages of development, to which DAR- 



win'S Law of Heredity can be applied. 

 (e) — And again, between the species of the same genus there 



are differences — the result of physiological processes. 



These are of great interest. 



III.— The Quadrumana oe Bangtaphan. 



K.—Hylobates lar (gibbon). (Wa-Wa). 

 Dissected 2 Adult Females. 

 1 Adult Male. 

 1 Foetus. 

 1 take the white circumfacial ring with the white dorsal as- 

 pects of the hands and feet as the distinctive mark of the 

 species. In the three specimens the amount and distribution 

 of the interdigital web varied ; so it does in all the species of 

 monkeys I have examined ; the colour of hair is of little value, 

 it varies with the sex, it varies with the year, and it varies 

 with the animal's age. 



B. — Papio nemestrinus (pig-tailed baboon). 

 Dissected 3 Adult Males. 



3 Adult Females. 

 3 Juveniles. 

 1 Foetus. 

 A stedfast species, It does not answer exactly to the des- 

 cription in MASON'S "Burmah," having the ringed hair, and also 

 a remarkable leonine appearance — in the male only. The baby 

 is of a greyish yellow colour with dark brown hairs along the 

 spine. There is a remarkable resemblance to the young of 

 the stumpy-tailed monkey. 



C. — Papio arctoides (the stumpy-tailed baboon). 

 Not nearly so abundant as the last species. Of these, as 

 yet I have made no dissections, but at present I have a couple 

 of tame ones. One is quite a baby with a white face, hair of 



