62 Dr. J. E. Gray on the Zoology of 



been collected from the stations on the different parts of the west 

 coast of Africa. A fuller examination has not altered my opinion. 

 But one animal escaped me (or perhaps it was not exhibited when 

 I was there); this is the one named Cy nog ale velox; for I now see that 

 it is not the animal which I entered in my list as " Lutra species," 

 and which is so named in the Appendix. 



I have since had an opportunity of examining all the smaller 

 species, and of comparing them with the specimens in the British 

 Museum, and I subjoin the result of that examination, as challenged 

 by M. Du Chaillu. I take the animals as they occur in the list of 

 species discovered by M. F. B. Du Chaillu, in the Appendix, p. 471. 



Troglodytes calvus, 



Troglodytes kooloo kamba. — When I examined the skins of 

 these two presumed new species, on the 13th of April, I was not 

 able to discover any character by which they could be distin- 

 guished from the common T. niger. Dr. Sclater and my assistant 

 Mr. Gerrard have each examined the skulls and skeletons, and they 

 inform me that they have come to the same conclusion ; and I observe 

 that Prof. Owen speaks of them as interesting varieties only. I 

 suspect the baldness is merely an individual peculiarity. I need only 

 refer to my observations on the figure of T. calvus in the last Number 

 of this Journal, p. 467. 



Tragelaphus albovittatus. — This is evidently only a specimen of 

 Antilope euryceros of Ogilby. It has unfortunately lost its hoofs, 

 and the ears and tail are eaten. See observations in the last Num- 

 ber, p. 469. 



Potamochoerus albifrons. — A mere variety of P. penicillatus. 

 Specimens from the same locality differ in having the face black and 

 white. 



Genella Fieldiana. — This is Genella pardina, I. Geoffroy. M. 

 Du Chaillu compares it with G. poetisis, a distinct species. 



Anomalurus Beldeni is only Anomalurus Derbianus, Gray (A. 

 Fraseri, Waterhouse). 



Anomalurus " not described yet " is Anomalurus Beecrofti, Fraser, 

 Proc. Zool. Soc. 1853, p. 17, t.32. It is the figure of this animal that 

 is copied and given as the figure of the former presumed new species. 

 The tail of the two specimens is short ; but one is imperfect, and the 

 other skinned, so as to make it look short. 



Cercopithecus nigripes (a variety of Cercopithecus Erxlebenii, 

 Dahlb. and Pucheran, Rev. Zool. 1856). M. Du Chaillu's specimen 

 and the one we have in the British Museum have the sides blacker 

 than in the figure above cited, which is said to be from a young spe- 

 cimen. 



Otolicnus apicalis. — This appears to be Galago crassicaudatus ; 

 but the ears of the specimen are entirely destroyed by rats or cock- 

 roaches. The white end of the tail seems to be accidental. 



Cynogale velox. — The specimen is in a bad state : only a skin — 

 skinned from the mouth, — wanting one foot, and without any skull. 



M. Du Chaillu thinks that, as Cynogale is an Asiatic genus, 

 the different shape and the proportions of the tail, and an African 



