19 



"The anatomical examination of this new species did not bring 

 to hght any remarkable deviations from the ordinary structure of 

 tlie Cercopitheci ; in which, as in the Baboons, the most interesting 

 circumstances are those which indicate the departure from the hu- 

 man type and the approximation to the carnivorous genera, e.g. 

 the genus Canis. Among these may be noticed the extension of the 

 superior or lesser cornua of the as hyoides, and the muscles which 

 connect them to the greater ; the projecting ridge on the thyroid 

 cartilage for the attachment of the thyreo-hyoidei ; the bone deve- 

 loped at the extremity of the peyiis ; the uniform character of the 

 lining membrane of the intestinal canal ; the simple ccecum, and its 

 loose mode of attachment to the abdominal parietes ; the order 

 of origin of the large arteries from the aortic arch ; the great extent 

 of the inferior cava in the thorax; the additional lobe to the right 

 lung ; the additional lobe to the liver; and the simple composition 

 of the kidneys. It is less necessary to notice the remarkable deve- 

 lopment of the laniarii in some of these species, as this circumstance, 

 together with their projecting orbits and receding forehead, has 

 procured for them from the most remote periods of natural history 

 an ap))ellaiion characteristic of the relation above alluded to. 



" The abdominal viscera of this Monkey were enveloped in a large 

 mneutum, extending to ihe pub es, and, as it were, tucked in at the 

 iliac and lumbar regions ; it was streaked with fat of a bright yellow 

 colour ; the line of adhesion was to the stomach and transverse. 

 colon, to the ascending portion of the colon, and as low down as 

 the ccBcum. The stomach had nothing of a sacculated appearance, 

 as found by Dr. Otto in a species of Semnopit/iecus ?, but the left 

 blind extremity was more considerable than in the Macaci and 

 Cynocephali, the cesopliagus entering at an equal distance from the 

 two extremities, I have observed the same circumstance in Cerco- 

 jnthecusj'idiginosns , The pyloric end lay immediately below the gall- 

 bladder, and had in consequence a deep circumscribed yellow stain. 

 The duodenum has the same short course as in the Mandrill, and 

 becomes a loose intestine as soon as it has crossed the spine. The 

 ccecum and ascending arch of the colon have an entire investment of 

 ■peritoneum, and are consequently more loosely attached iothe parietes 

 of the abdomen than in the human subject. At tlie commencement of 

 the transverse arch the colon is connected with the duodenum ; it ter- 

 minates in a considerable sigmoid flexion on the left side of the abdo- 

 men. The cacum is puckered up by four longitudinal muscular bands, 

 of which one terminates at the entry of the ilium, and the other three 

 are continued on to the colon. The interior of the jejunum presented 

 a singular appearance from numerous minute black spots, not unlike 

 the skin of a Sepia ; when viewed through the microscope they 

 were found to be situated at the extremities of the villi, which are 

 very minute and disposed in delicate zig-zag lines; the black points 

 disappeared on sponging the surface three or four times. In the 

 omentum was found, what rarely occurs in Quadrvmana, viz., a cyst 

 containing the Cysticerciis tenuicollis of Rudolphi ; differing only in 

 its smaller size from those of the sheep and other ruminants. 



