J\/ainmaIs/rom the Ja River, Cameroons. 4o 



skull-dimensions. Coloration similarly conspicuously bicolor, 

 but the line of demarcation slightly lower, so that the dark 

 colour encroaches a little on the forearms, instead of these 

 being wholly in the white area. General colour above 

 between cinnamon and bistre, the back more heavily black- 

 ened than in gosUngi. White patch at outcK base of ear 

 smaller than in goslingi. Arms and hands white except for 

 a narrow extension of the dorsal colour downwards from the 

 shoulder to the middle of the forearms. Feet greyish tlesh- 

 colonr. Tail blackish above, whitish below, the difference 

 not conspicuous. Mamma) apparently 2 — 1 = 6. 



Skull similar in all essentials to that of C. goslingi, but 

 larger throughout. Nasals longer. Intcrorbital region nar- 

 rower, its edges more rounded. Brain-case longer and 

 higher. Palatal foramina with the peculiar expansion on the 

 septum, previously described, so developed as to touch, on 

 one side, the outer wall of the foramen, and so isohite com- 

 pletely its posterior end. 



Dimensions of the ty|)e (measured in the flesh) : — 



Head and body 1-43 mm. ; tail 175; hind foot 39 ; ear 21. 



Skull: grea'est length 36 ; condylo-incisive length 32*y ; 

 nasals l-4"2 ; intcrorbital breadth 4:"5 ; breadth of brain-case 

 15"2 ; palatilar length 16"7 ; diastema 10*2 ; palatal foramina 

 7"3 x3'2 ; upper molar series (worn down and contracted) 5'2. 



JIah. Bitye, Ja Kiver, S,\V. Caiueroons (West Congo 

 drainage area). Alt. 2000'. 



T'ype. Old female. Original number 569. Collected 23rd 

 October, 1911, by Mr. G. L. Bates. 



The smaller species, C. gosUugi^ Thos. & Wrought., was 

 found on the Welle Hiver, so tliat the genus is evidently 

 widely distributed in the Congo area. 



Ei>imys ceta, Thos. 



Mr. G. L. Bates has sent from Bitye some further 

 examples of this distinct little species, and these show that 

 the type had by no means attained its full size, especially as 

 regards its skull. The following measurements of a fully 

 adult female are therefore worthy of record : — 



Head and body 93 mm. ; tail 120; hind foot 18 ; ear ll'o. 



Skull: greatest length 26 ; condylo-incisive length 24'2 ; 

 zygomatic breadth 13'5 ; nasals 8*7; iuterorbital breadth 4*5; 

 breadth of brain-case 12"3 ; palatilar length 11*6; diastema 

 7'6; palatal foramina 5*2 ; U[)per molar series ^'6. 



