564 FOSSIL MARSUPIAL WITH LARGE GROOVED PREMOLARS, 
Most of the marsupials belong either to extinct species or to 
species not now living in the district. 
The subject of the present paper is one of the most interesting 
forms found, and as I am not aware of its having been previously- 
observed, and as its dentition is unlike that of any known mar- 
supial, I have formed a new genus for it, called after the abori- 
ginal name of the district. 
Burramys parvus, gen.'et sp. nov. 
The form is characterised by having above and below a large 
grooved premolar followed by three well developed molars. In the 
lower jaw the large premolar has six well marked grooves on each 
side passing upwards and slightly backward and giving the tooth a 
serrated edge. As the grooves run approximately parallel to the 
anterior border of the tooth and to each other, and as the anterior 
and posterior borders converge considerably above, there is left a 
considerable portion of the posterior part of the tooth ungrooved. 
This premolar is placed obliquely in the jaw, the line of its edge 
passing considerably outwards from the line of the molars. The 
first molar bears some resemblance to the corresponding tooth in 
Petaurus, having two posterior and a large anterior cusp: it differs, 
however, in the anterior cusp pointing more outwards. The second 
molar is slightly oblong and has four well developed cusps; of these 
the anterior outer cusp has a small secondary one springing from it, 
while the posterior inner one is partly divided by a well marked 
furrow. The third molar is less developed and apparently quadri- 
tubercular. Behind this there appears to be a rudimentary single 
rooted and apparently functionless fourth molar, which is generally 
lost in the specimens found. In front there is a long straight 
flattened and pointed incisor directed considerably upwards from 
the axis of the jaw. Between the base of this incisor and the 
anterior part of the large premolar are live minute tooth sockets 
which have apparently been occupied by two double-rooted pre- 
molars and a single-rooted anterior tooth — possibl} T a minute 
second incisor. Behind, the jaw has a very marked inflected angle 
