12 GYLDENSTOLPE, ON A COLLECTION OF MAMMALS MADE IN EASTERN AND CENTRAL BORNEO. 



As a rule the male specimens have larger brains than the females, which are 

 of less size than the former, and it is therefore rather notevvorthy that one of the 

 females has a brain-capacity almost equalling that of a fullgrown male specimen. 



The shape of the palate, the length of the upper molar series, the breadth of 

 the palate betvveen the first and the last molar etc. seems to undergo a great amount 

 of variation. Thus the male specimen with the smallest brain-capacity (orig. number 

 17) has the longest toothrow and the largest teeth. The shape of the palate in this 

 same specimen is also somewhat different from that of the other specimens. The 

 palate is thus much narrovved off posteriorly and between the inner edge of the 



Textfig. 1. Naaalis lurvatus Wurmb. o" Kaboreau, Eastern Borneo l, /i 1914. Nat. size. Molar series very short. 



last molars it only measures 18,8 mm., while between the inner edges of the anterior 

 premolars the distance is 23,0 mm. In this same specimen the molar series are 

 placed in an almost straight line, while in the other specimens the toothrow is 

 narrowed off both anteriorly and posteriorly, thus being broadest at the middle part. 



The Kaboreau-specimen (orig. number 9) is fairly aberrant from the remain- 

 der of the series both as to the colour of the fur and to several skull characters, 

 and it is highly to be regretted that only a single specimen was collected by Mr. 

 Lumholtz from these parts of Borneo. To commence with the skull this specimen 

 has the shortest molar series of the whole series, though it is of practically the same 

 age as several of the males from Central Borneo. Further the bony palate is con- 

 siderably shorter. The bullae are much higher and better developed etc. 



As to the colour of the fur this specimen is considerably brighter and the 



