124 
FOSSIL JAWS OF MACROPODIDsE, 
hinder lobe, compressed, acuminate and separated from the lobe 
by a deep notch both superiorly and posteriorly. 
The vertical groove on the hinder surface of the molars is 
sometimes double; frequently its base is enclosed by an elevated 
rim which may bulge outward and convert the groove into a deep 
pocket. 
Maxillary. — P. 4 (PI. xvm. fig. 14) has a general resemblance to 
the lower premolar, but the anterior lobe is much shorter and lower 
than the posterior, the long compressed blade of which bears low 
down on its intero-posterior surface a small trihedral pointed cusp. 
On the intero-anterior base of the fore lobe is a tumid margin a, 
representing perhaps the last trace of an inner ledge. Mesial 
diameters 10-5 x 4 -7. 
P. 3 (PI. xvm. fig. 13) is almost equally bilobed; the maiden state 
of its surface is not exemplified, but from vestiges left in the worn 
tooth it may be safely said to have had a ledge running the whole 
length of its inner side and terminating in an intero-posterior 
cusp; the hinder lobe is furnished with a well developed extero- 
posterior cusp (a, PI. xvm. fig. 15), a feature which occurs in the 
recent M. giganteus, but in one other instance only among 
extinct Macropods in Sthenurus. 
Examp'es — two hundred and eighty-three. 
The collection embraces 134 adults, 40 adolescents, and 47 
young mandibles — 47 adult and 15 young maxillae, besides 
isolated teeth in large number. The identity of young specimens 
has in the great majority of instances been established by extrac- 
tion of the permanent premolars from their crypts. 
It may be observed that Owen's M. titan, from the Wellington 
Caves, has not been recognised among the fossils of the Darling 
Downs. 
Macropus pan, n.s. 
Molars elongate with curved crests, rounded angles and strong 
links. Anterior upper molars with the outer midvalley divided 
by a vertical plate; all with an adpressed fold posteriorly. Lower 
