4.70 Mr. 0. Tliomas on the 



It is rather a surprise to find S.j^oensis is not a Fum'sci'uruf!, 

 but has Sci'urus-Yike basin-shaped molars. S. lucifer is more 

 doubtful, and may perhaps be a Paraxerus, but no specimens 

 with unworn teeth are as yet available. 



2. Heliosciurus. t^ q 



Trouessart, Le Nat. ii. no. 37, p. 292 (1880) H. gambianm*. 



Sciurus b, a, Major, P. Z. S. 1893, p. 189. 



Skull square and strongly built. Anteorbital foramen 

 well in front of the level of the cheek-teeth. Anterior ridge 

 of zygoma-root strongly marked, Stopping abruptly just at 

 the maxillo-premaxillary suture. 



Teeth - ; the single premolar large, its anterior cusp very 



prominent and evidently taking on the function of p\ Molars 

 of typical Sciurus structure, the lower ones clearly basin- 

 sliaped, without trace of transverse ridges. 



Bange. Ethiopian Region except South Africa. 



List of species below. 



3. Myrsilus. rr 



Type. 



Genus novum M. aubinn'd 



(Macroxus aubinnii, Gray). 



External form normally Sciurine, but tail unusually long 

 and slender. 



Skull unusually shaped, very high, strongly convex in the 

 naso-frontal region ; maxillary masseteric fossa large, its 

 upper ridge extending some way past the maxillo-premaxillary 

 suture, as in Protoxerus ; anteorbital foramen large, rounded, 

 open, its hinder edge above p\ the part of the zygoma-root 

 behind it reduced to a broad bar, an approach to this structure 

 being shown by Protoxerus. 



(Jheek-teeth |. 



Lower niolars rather of the irregular basin-shaped structure 

 found in Protoxerus, not transver.sely ridged. 

 Ranae. W. Africa ; Liberia to Ashantee. 

 Mursilus is a very peculiar form whose affinities I feel by 



* H annulatus, Trouessart et >uct. al., but the evidence for the 

 ■flpntification of Desniarest's non-lo^,alised S. annulattis, of which the 

 t oe no longer exists, with the GanJjian squirrel is so insufficient that 

 I am not prepared to accept it. 



