GENERIC CHARACTERS. 
Molar teeth 4 _ 4 , looted, skull, without post-orbital process; ant-orbital opening, large; 
palate, contracted between the anterior molar teeth: tail, long and bushy, excepting at the base; 
the basal third armed beneath with a double series of large scales, having each an angular projec¬ 
tion: ears, large, nearly naked: flank membrane, extended from limb to limb as in the Flying 
Squirrels (. Pteromys ): tip of muzzle, naked: feet, naked, beneath: fore-feet, with four sub-equal 
claws: hind-feet, with five toes; the inner toe, short: all the toes provided with long, curved, and 
compressed claws. 
Fraser’s Anomalurus. 
Anomalurus Fraseri, Waterhouse, Proc. Zool. Soc. 1842, p. 124 (September); Ann. and Mag. Nat. Hist. 1842, p. 201 (November). 
Arothraus Fraseri , Waterhouse, ibid. J 
Pteromys Derbianus, Gray, Ann. and Mag. Nat. Hist. 1842, p. 262 (December). 
The Anomalurus presents, in the structure of its skull, some points of resemblance both to 
the Sciurida; and Myoxidte; from either, however, it is distinguished by the large size of the ant- 
orbital opening, and from the former family by the absence of post-orbital process to the frontal 
bone. In having the tibia and fibula distinct, it differs from all the Muridce (including Myoxus), 
where these bones are anchylosed at their distal extremity. 
The following extract is from Mr. Waterhouse’s notes :— 
poii a cursory inspection this animal would be regarded as a species of Pteromys , having most of the 
betwpeu +b emal cbaractera of the members of that group; there are, however, some points of distinction 
h , 6 pre . Se an ™ al and the lar S e % lo S squirrels, which are important; of these the most conspicuous 
ethe extraordinary scaies which cover the under side of the basal third of the tail: these scales are of a pale 
two lnnZV S1X 6011 m """“I “ ° ne ° f tW ° S P ecimens before and fifteen in the other, and arranged in 
o7a SiTV eneS L? T " ^ ^ baSC and br ° ad at the °PP° site extremit y> »d in fact nearly 
thev not S 1 orm > but as the scales on one side alternate with those of the other, no interstices are left; 
they not only cover the under surface of the tail, but overlap the sides; in this overlapping of the scale a ridge 
