224 MR. R. I. POCOCK ON THE 



much as in Tomeutes vittaius. In the latter, however, the apex 

 of the shaft is expanded and button-shaped, not compressed as in 

 LarisciiyS jcdorensis. (Text-fig. 22, E.) 



The baculum of a specimen of Rhinosciurus robinsont from 

 Tiernan Island, in the British Museum, is very like that of 

 Tomeutes lohroides. The shaft is short, proximally thick, distally 

 upturned, with a short concavity, with its large blade pro- 

 jecting high above it and overlapping the proximal end. 

 The upper edge of the blade is nearly straight, but is 

 irregulai'ly notched in its posterior half. The bone measures 

 10 mm. (Text-fig. 22, F.) 



In a specimen of Tamiojys madellandi barbel from Kokareet, 

 in the British Museum, the shaft of the baculum gradually nar- 

 rov/s from base to apex, its distal half being upturned at an obtuse 

 angle. The blade has a long hinge but is short, the point being 

 very narrow, with a notch and tooth near its apex. Its upper 

 edge is only slightly highei- than a line touching the upper edge 

 of the proximal and distal ends. The bone measures 5 mm. 

 (Text-fig. 22, G.) 



In four species of Dremomys, namely, D. lokriah from Sikkim, 

 D. I'ufigenis from H'Kauti, Chindwin, D. rufigenis fuscus from 

 Annam, and JJ. daivsoni from Tatken, Chindwin, the shafts of 

 the bacula are longish and longer than the blades. In that of 

 D. rufigenis the proximal end of the shaft is very thick and 

 raised, the median part is straight, aiid the upcurved distal end 

 has an evenly convex edge. The upper edge of the blade is 

 markedly convex to the apex, which falls far short of the proximal 

 end of the shaft ; its lower edge is straight with a pronounced 

 concavity near the hinge. The baculum of D. rufigenis fascus is 

 sufficiently different to suggest specific distinction between the 

 two forms. The shorter shaft is comparatively narrow proxi- 

 mally, its inferior edge is evenly convex, the upcurvature beginning 

 beneath the inferior end of the hinge ; the blade is larger as 

 compared with the shaft, has a longer hinge, an evenly concave 

 lower border, and a less convex upper border. In D. daiosonl 

 the shaft overlaps the blade proximally to an even greater extent 

 than in D. rufigenis, but it is not so stout, and its lower edge is 

 inclined upwards from a point below the inferior end of the 

 hinge as in D. rufigenis fuscus, but more abruptly, and the con- 

 cavity of the lower edge does not extend up to the bottom of the 

 hinge, the edge at this point being slightly convex. In D. loh- 

 riah the shaft is very like that of D. rufigenis fuscus, but is a 

 little stouter distally, and the lower edge of the blade is straight 

 ap to the point where it runs into the thickening forming the 

 lower end of the hinge. (Text-fig. 22, A-D.) 



The bacula of the species of Dremomys above described may 

 be contrasted as follows : — 



a. Lower edge of shaft tolerably straight for tlie greater part of its 

 length, distal end of shaft expanded with strongly rounded edge ; 

 blade thinner, with wide emavgination close to short hinge rufigenis. 



