TAILED iMoNKIA'S. 



43 



The chest is always Hattened at the sides, 

 not broad as in the anthropoid apes. 

 Althoup'h the dental formula 



(^^ '-^^^-^^ = S- teeth 



\2 . l . 2 . ^ 



is the same in all tailed monkeys as in man 

 and the anthropoid apes, yet there are con- 

 siderable variations within this formula, 

 variations which, apart from the definite 

 form, are partly due to age partly to sex. 

 From the herbivorcxis Semnopitheci, whose 

 constricted stomach, almost adapted tor ru- 



minants, plainly shows what they are 

 intended for in this respect, and whose 

 nearly square molars soon lose by friction 

 their blunt knobs or tubercles, there is a 

 long series of gradual modifications til 

 we rise to the Cynomorphce, and more 

 particularly the Gelada, in whose frightful 

 jaws the long narrow laterally compressed 

 molars with four sharp tubercles Avhen 

 seen from the side present exactly the 

 appearance of the dentition of a carni\-ore. 

 1 he last molar is sometimes larger, some- 

 times smaller, sometimes with four, sometimes 

 with five tubercles, but these differences do 

 not appear to have any influence on the rest 

 ot the organization. 



As regards the significance to be attached 

 to the canines it is necessarv to be very 

 cautious. If the enormous, sharp, curved 

 canine with sharp cutting edge behind in the 

 upper jaw ot the Cynomorpha-. and above all 

 in the Q-elada, can scarcelv be matched even 



