226 MR. R. I, POCOCK ON THE 



3. The Ethioiyian Species. 



In Protoxerus stangeri, as identified by Tullberg, the glans 

 penis is elongated and nearly straight, but exhibits at the distal 

 end of its proximal half a large swelling, showing a pair of low 

 crests above and a pair of distall}'- directed pointed processes 

 below. Beyond the swelling the glans is gradually narrowed 

 towards the apex, but the apex itself is shaped like an arrow- 

 head, with the point slightly upturned and a pair of small 

 swellings just before it. (Text-fig. 23, M.) 



The baculum of a specimen of this species from the Como 

 River, in the British Museum, is a symmetrical bone, slightly 

 concave above, convex towards the middle below, a little upturned 

 at the apex, which ends in a blunt condyle-like button. On each, 

 side of the shaft in its distal third towards the apex there is a 

 faintly defined longitudinal crest. The proximal end, or base, is 

 much thickened, and carries a coronet consisting of five sym- 

 metrically arranged bony lobes, one being in the middle line 

 above and two on each side, the two lower lobes being separated 

 by a notch in the middle line below. There is no doubt, I think, 

 that the thickened proximal end of this bone is imbedded in the 

 tissue forming the submedian thickening of the penis described 

 and figured by Tullberg, and, from analogy, I suspect the button- 

 like tip of the baculum is lodged in the thickened portion of 

 the arrow-headed apex, (Text-fig. 19, 0.) 



The actual length of the bone, despite the large size of the 

 Sqxiirrel, is 7*5 mm. 



In ^thosciurus poensls, as identified by Tullberg, the glans 

 penis is quite short, and consists of a thickened proximal portion, 

 composed of two transverse folds of soft tissue of which the 

 posterior has a finely serrated posterior border on the upper side, 

 and of a slender distal portion which gradually narrows from the 

 base to the simple apex. According to Tullberg, the glans penis 

 of this species has no baculum, but from analogy I suspect a 

 small baculum, imbedded in the tissues, was overlooked. 



In an example of Fuaiscmrus lencostigmci from Bibianaha the 

 glans penis is not at all unlike that of ^E.poensis. Its proximal 

 portion is quite short and thick, consisting of soft grooved tissue, 

 but the distal portion, abruptly differentiated from the proximal, 

 is a comparatively slender somewhat Qexible rod, tapering apically 

 but furnished on each side with a serrulated crest starting distally 

 behind the tip and ending proximally on the upper side of the 

 thickened base. These two crests define the upper from the 

 latei'al surfaces of the process. (Text-fig. 23, E-G.) 



In Fanisciurtis leucosf.igma niveatus the glans penis differs 

 somewhat from that of F. leucosiigma above described, although 

 consisting of a short undifferentiated proximal portion, a swollen 

 laminate and grooved median portion, and a thinner longer distal 

 serrulated flexible portion. The median portion, however, is not 

 so thick as in typical F. leiocostigma, and the distal portion is 



