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MR. R. I. POCOCK OX THE 



the bone. It lies over a well-marked groove, and there is a 

 second shallower groove on the right side of the bone. The bone 

 measures 12-5 mm. (Text-fig. 28, A, B.) 



Despite its straightness and apical notch, this baculum is 

 similar in type to that of Rylopetes^ the crests on the left-hand 

 side of the two corresponding closely. The crest in Olaucomys 

 terminates on the left side of the bone instead of passing on to 

 its lower surface as in Rylopetes. The surprising difterences 



Text-fiOTre 28. 



A. Baculum of Glaucomys volans, from the left side. 



B. The same from below. 



C. Baculum of Sylopetes alhoniger, from the left side. 



D. The same from below. 



E. Baculum of S. phayrei, from the left side. 



F. Baculum of Fetinomys fiiscocapillus, from the left side. 



G. The same from below. 

 H. The same from above. 



between the bacula of Glaucomys and Eoglaucomys have already 

 been mentioned under the description of the lattc^r genus. 



The baculum of a specimen of Belomys (?) trichotis from Yin, 

 (Jhindwin, in the British Museum, is hardly longer than that of 

 Eoglaucomys, but is otherwise very different from it. The 

 proximal portion consists of a stout subcylindrical "handle," 

 sharply geniculated where it passes into the abruptly upturned 

 distal portion, which ends in a wide lamina, shaped like a 



