360 



QUADRUMANA, 



251 



252 



253 



Fig. 250. The Malbrouck Monkey, a genuine representative of the genus CercOpithecus. 

 Fig. 251. The Bonnet Monkey, of the geuus Macacus, closely allied to the Cercopitheci. 

 Fijf . 252. The Pig-tailed Monkey, also a Macacus, but more widely removed from the Cercopitheci, and 



approaching the Cynocephali. 

 Fig. 253. The African Baboon, or Chacma, one of the Cynocfpluili, with the muzzle developed to the 



With respect to the Baboons, it will be easy to shew a regular grada- 

 tion between them and the Cercopitheci. In some of the Macaques, with 

 a moderately produced muzzle, the tail is elongated, as in the Cer- 

 copitheci, to which they also approximate in the form and contour of 

 the limbs and body. Others of the Macaques, on the contrary, as 

 the Pig-tailed Macaque, with a dog-like muzzle, have an abbreviated 

 tail, and, as already shewn, closely approach the genus Cynocephalus. 

 The genera Cercopithecus, Macacus, and Cynocephalus (including the 

 sub-genera into which naturalists may divide them), are, in fact, merely 

 modifications of one type : and it may be added, that it is in such a 

 group, the most remote from the highest of the family, that the fluc- 

 tuations and extremes in external characters are to be expected ; such 

 as in the length of the tail and the projection of the muzzle ; while, at 

 the same time, it may be observed, that, in proportion to the distance 

 of a group from the highest (whether that group be one of sub-family, 



