274 DR. J. E. GRAY ON MR. DU CHAILLu's [June 25, 



individual peculiarity. The same difference of form is said to occur 

 in the skulls of the Gorilla. 



Cercopithecus nigripes, Du Chaillu, Bost. Journ. p. 360. 



Tliis species is evidently different only in age from Cercopithecus 

 e)-xlebe7iii, Dahlb. & Pucheran in Rev. Zool. 1856; Dahlb. Studia 

 Zool. i. 102, t. 5. f. 12. 



Mr. Du Chaillu' s specimen and the one in the British INIuseum 

 have the sides blacker than in the figure above cited ; the latter is 

 said to be from a young specimen. It has been compared with C. 

 poffonias. 



Otolicnus apicalis, Du Chaillu, I. c. p. 361. 



The specimen of this species is formed on evidently an Otolicnus 

 or Galago ; but it is in a very bad state, and the ears are quite de- 

 stroyed, apparently by mice or cockroaches. 



The vrhite at the end of the tail I should say was an accidental or 

 individual peculiarity, not a specific mark. It is very like Galago 

 crassicaudatus, judging from the description. 



There is a young animal in the collection, that appears to belong 

 to the same species, which has not the white tip to the tail. 



Genetta fieldiana, Du Chaillu, I. c. p. 302. 



This species is only the Genetta pardina of I. Geoffroy. It is 

 erroneously stated by Mr. Du Chaillu to be allied to G. poensis. 



Cynogale velox, Du Chaillu, I. c. p. 361. 



The specimen is in a bad state : only a skin (skinned by the 

 mouth), with only three feet, the end of the tail broken, and without 

 any skull. 



The feet are rather small and weak ; the toes compressed, not 

 webbed ; the five toes of the forefeet all free ; the five of the hind feet 

 very unequal, the two outer being the strongest and longest, the two 

 middle rather shorter, more slender, united together to the nail ; the 

 inner much shorter, slender, and free ; claws all compressed, curved. 

 The tail is very strong, thick (compressed in the skin), and covered 

 with short close-pressed hairs ; the upper part of the base and the nar- 

 row central ridge along the upper surface covered with longer hairs, 

 like the back. The fur, like that of the Otter, with longer, flat, stri- 

 ated hairs. Whiskers very long, rigid. Ears thin (part eaten), 

 small. 



This may be a Glirine animal ; it certainly has no affinity to my 

 genus Cynogale. It is more like the genus Fiber, which has a similar 

 tail. 



Mr. Du Chaillu observes : " Only a single species oi Cynogale being 

 described, and that a native of Asia, I thought the different shape 

 and proportions of the tail, with its African habitat, were suflficient to 

 make this the representative of a different genus, for which I pro- 

 pose the name of Potamogale, Preferring, however, to wait until I 



