242 



MR. R. I. POCOCK ON THE 



suggested by their names, of Eoglaucomys with the North 

 American Glaucomys, the differences between their bacula are 

 very striking and suggest that the I'esemblances between the 

 genera, which induced Thomas in his revision of the Petauristidse 

 to refer finihriatus to Glaucomys, are purely convergent. The 

 differences between their bacula are apparently indeed greater 

 than the differences between the bacula of any other two 

 species. (Text-fig. 29, H-K.) 



In Hylopetes alboniger the glans penis is very different from 

 that of Eoglaucomys. The distal half of the glans is narrowed 

 and curved considerably towards the left and upwards at an 



Text-fia^ure 27. 



A, B. Glans penis oi T^oglaucomi/sfimhriatus, from riglit and left sides. 

 C. Apex of the same from the front. 

 D, E, F. Glans penis of St/lopetes alhoniger from right side, left side, and 

 above. 



angle of about 135°. On the left side of the upturned portion 

 there is a crest running downwards from the apex and ending 

 near the middle of the lower convex surface in a well-marked 

 compressed point. Near the base of the glans on the upper 

 surface there are two crests, one in front of the other and 

 defining a kind of saddle-shaped area ; these ci-ests pass down- 

 wards on to the right side of the glans. I could not find the 

 orifice of the organ of the specimen examined. (Text-fig. 27, 

 D-F.) 



The baculum, measuring 13mm., is shaped distally like the distal 

 portion of the glans, having the same upward and sinistral curva- 



