492 QUADRUMANA. 



With respect to the presence of laryngal sacculi, some doubt still exists. 

 Though the account of the stomach given by M. Riippell (see his 

 description of the Guereza) is very superficial, it is sufficient to satisfy us 

 that this viscus approaches, if it does not quite resemble, in its sacculated 

 character, that of the Semnopitheci. With respect to the caecum, he states 

 it to be rather small, and shaped like a nine-pin ; if this account be 

 correct, the difference between the Colobi and Semnopitheci, as far as this 

 is concerned, is very considerable. The length of the intestinal canal in 

 the Colobi, taking the Guereza as the standard, agrees with that of the 

 intestinal canal of the Semnopitheci. The small intestines of the Guereza 

 measured nine feet seven inches and a half ; the large intestines three feet 

 eleven inches ; total, thirteen feet six inches and a half. The dentition 

 of the two groups is precisely similar, as also is the form of the 

 cranium (see fig. 288), which is remarkable for the boldness of the 

 supra-orbital ridge, the distance between the orbits, the angularity and 

 lateral projection of their osseous margin, and the depth of the lower 

 288 j aw - As regards external characters, in 



physiognomy, in the presence of a pro- 

 jecting row of superciliary bristles, in the 

 slenderness of the body, and length of the 

 limbs and tail, the Colobi are repetitions, as 

 before stated, of the Semnopitheci. Even 

 in the fur may be traced their mutual 

 resemblance ; it is generally long, flow- 

 ing, and glossy; and its character and 

 colouring serve, as in the Semnopitheci, to 

 subdivide the Colobi into sets or sections. 

 Of these, one section contains the species, either wholly black, or black 

 ornamented with white ; and with the hair, either of the whole body or 

 of certain parts, peculiarly long and flowing ; another section contains 

 a set with long glossy hair, but not so long, on an average, as in the 

 former, and remarkable for the mixture of black and bright maroon, bay 

 and yellow, or dark and light bay, with which they are coloured ; in size, 

 too, they are scarcely equal to the former. A third section may be 

 added, in which the fur is comparatively short, and, though still soft, 

 partaking more than does that of the others, of the texture of the fur of 

 the Cercopitheci : it also agrees in colour with that of a numerous group 

 of the Cercopitheci, being olive, varying from a brownish to a greener tint, 

 the hairs being annulated with black, a peculiarity not found in either of 

 the foregoing sections, nor yet in the Semnopitheci. Of this section one 

 example only is known ; viz., the Colobus verus of Van Beneden ; if, 

 indeed, it be a Colobus. 



Till within the last few years the genus Colobus comprised only 



