568 
ON A SMALL FOSSIL MARSUPIAL ALLIED TO 
PETAURUS. 
By R. Broom, M.D., B.Sc. 
(Plate xlvi.) 
In the bone breccia deposit in the neighbourhood of the 
Wombeyan Caves in which I discovered Burramys, I have been 
fortunate in finding the remains of another small marsupial, also 
new to science. Of this form I have obtained the greater part 
of an upper jaw, and an almost complete and two imperfect lower 
jaws, and also a most important portion of the cranium. 
From the structure of the teeth the form is closely allied to 
Petavrus and to Gymnobelideus, and though further details may 
lead to its being included in one or other of these genera, as it 
presents features distinct from both and also affinities with each 
I have provisionally placed it in a new genus. 
Pal^eopetaurus elegans, g. et sp.nov. 
Dental Formula : — As in Petaurus and Gymnobelideus so far 
as known. 
Upper Jaw: — Incisors unknown; canine somewhat conical, less 
flattened than in Petaurus and somewhat shorter proportionately; 
first premolar smaller than the canine, conical and rather blunt 
at. the apex, single-rooted, antero-posterior length of base very 
slightly greater than the height, in the unworn tooth possibly 
less; second premolar (pm. 3 ) with very low crown as in Petaurus 
and considerably developed antero-posteriorly, with the main cusp 
a little in front of the centre of the tooth instead of behind it as 
in Petaurus, and with two well developed diverging roots; third 
premolar (pm. 4 ) large and triangular, proportionately larger than 
in Petaurus and Gymnobelideus* and appreciably higher than 
the canine; first molar differing from Petaurus in having the two 
McCoy. Prodr. Zool. Vict. Decade x. PI. xoi. (1883). 
