MAMMALIA SIMILE. 19 



For Macac,us Gelada, Hupp., Is. Geoffrey is disposed to 

 establish a separate genus. (Arcliiv. du Mus. ii, p. 57C.) 



He distinguishes this ape from the baboons by the nostrils not being alto- 

 gether apical, and the incisors being almost perpendicular ; characters which, 

 in my opinion, are not sufficient to distinguish it gcnerically from Cynocephalus. 



Tlie same zoologist has made a valuable contribution to 

 the more accurate knowledge of the Cynocephalus Babuin. 

 (L. c. p. 579, tab. 6.) 



The " petit Papiou" of Buffon, according to him, does not belong here, 

 but, as well as the " grand Papion," to C. sphinx. Moreover, he asserts that 

 both Fr. and G. Cuvier have erroneously stated the face to be flesh-coloured, 

 wJiilst it is almost entirely black. The true diagnostic character he finds in 

 the haii-, wliich, instead of presenting, Like that of C. sphinx, delicate rings 

 of yellow and black, exhibits broad, and not numerous lings. C. anubis he looks 

 upon as very doubtful. Lastly, he remarks upon the circumstance, that 

 when young the baboons are very slender and agile, whilst when old they 

 become thickset and unwieldy. 



Allied forms are characterized by Ogilby (Ann. Nat. Hist, xii, p. 440) 

 under the names of Cynocephalus thoth and choras, both from living speci- 

 mens. The former has the hair longer in the anterior part of the body than 

 posteriorly ; the colour of the upper and outer parts is dark olive green, and 

 of the under side light yellowish green; breast, throat, chin, and lower half of 

 whiskers silvery gray ; face, dirty livid flesh colour ; callosities very large 

 and flesh-coloured, the naked haunches, on each side of them, dark purple, 

 or violet-brown; scrotum brown, sheath of the penis flesh-coloured. He 

 would distinguish this C. thoth from C. anubis and sphinx by the gray colour 

 of the hair on the hind fingers, the dark purple colour of the buttocks, 

 and the brown scrotum, the two latter species having the callosities of a 

 bright blood-red, and the scrotum pale flesh-colour. The colour is said to 

 approach C. sphinx more than C. anubis, while the bright yellowish green is 

 replaced by a sordid dunnisk brown, and the slender form of C. sphinx by a 

 more robust one. Ogilby regards this C. thoth as identical with the two 

 specimens brought byRiippell from Abyssinia, who has designated them in the 

 catalogue as C. anubis (the Babuhi). The other species, C. choras, is derived 

 from a half-grown male, procured on the Niger expedition, with long, shaggy, 

 deep rnssct-brown hair, each hair being aunulated with rusty brown and 

 black rings ; face, supercilia, fingers, buttocks, and scrotum dark-brown, the 

 upper eyelids alone flesh-coloured. Differs from C. anuUs in the colour of the 

 hair, the want of a light flesh-coloured circle around the eyes, and the dark- 

 brown buttocks. The difference in the above description sufficiently shows 

 thai we shall not soon arrive at satisfactory conclusions on the relations of 



