930 RO.BERT COLLETT, 



The black stripe on the back is very distinct, and extends to the 

 root of the tail. 



The skull. 



The skull is distinguishable from the skull of Petaurista by the 

 broad and flat interorbital space, by the long and narrow nasalia, 

 which extend forwards to above the apex of the intermaxillary, by the 

 nonperforated ossa palatina; besides by the lower jaw having proc. 

 coronoideus directed obliquely backwards, while in Petaurista this is 

 more vertical. 



The foramina incisiva are very short, extending barely to beyond 

 the canine. The auditory bulla is somewhat contracted in the middle. 



The teeth. 



The teeth are (as in Dadylopsila) rather bluntly pointed, and 

 the dentition appears to be very constant. The canines and premo- 

 lars are especially complete in number, and do not appear to be de- 

 ciduous. 



The dental series in the lower jaw is almost uninterrupted. 



The dentition is: i f, c |, j? |, m f (40). 



In the Upper jaw, the central incisors touch each other from the 

 middle downwards. 



In this species, as well as in the following, the obliquely worn 

 surface of is lies on the outer side of the tooth, in i^ on the inner 

 side (as normal). 



The canine is larger than either i'^ or « 3 , but, like the two fore- 

 most premolars, is greatly compressed. 



Of the premolars, p 1 , seen from the front, is nearly as large as 

 ^ 3 ; it has two roots, but is greatly compressed. ^ 2 is considerably 

 smaller, but not rudimentary. The molars evenly decrease in size 

 towards the back; wi is largest. 



In the lower jaw, the canine is blunt and flattened, and close to 

 the incisors. Of the premolars, p^ , as a rule, has a Single root, p 1 

 and p 3 , double roots ; but in one of the specim'ens, a trace of a divi- 

 sion of the root also in p-^ can be seen on one side. In nn, 

 the foremost cusp extends beyond the other cusps of the tooth, and 

 forms the most prominent point of the teeth in the lower jaw behind 

 the incisors. The twO back molars are smaller than the two front 

 ones; m* is the smallest. 



In the young, the skull of which has a length of 31 mm, breadth 

 18 mm, the milk premolar is in use at the sarae time as all the true 

 premolars. Of the incisors, i 1 is but half developed, and i 3 just pro- 



