MAMMALIA 499 
The skull is seen in side view in Fig. 343. 
Notice speci- 
ally the continuation of the malar to the glenoid cavity, and 
Fig. 343. -LATERAL VIEW OF SKULL OF A YOUNG KANGAROO. 
(Ad nat.) 
Lacrymal Foramen. 
Incisor 
Teeth. % 
Lower 
Incisor, 
First Molar. 
Angle of Mandible. | 
Paroccipital Process, 
Note the dentition with only two lower incisors, no canines and five cheek-teeth. 
Also the Metatherian characters. 
the situation of the lacrymal 
foramen outside the orbit, 
the incomplete ossification 
of the palate and the in- 
flected angle of the lower 
jaw. 
The dentition is pecu- 
lar. There are three upper 
incisors, flat and chisel- 
shaped, then a space or 
diastema in which there are 
no teeth. The canines are 
absent, though occasionally 
present in some kangaroos, 
and there are five cheek- 
teeth. But the true dental 
formula of a karigaroo is 
3.0.2.4, So that there should 
be séx cheek-teeth in all. 
Fig. 344.—VENTRAL VIEW OF 
SKULL OF KANGAROO x }. 
(Ad nat.) 
Incisor Teeth. 
Ltt 
in Palate. 
The reason for the discrepancy is that the first premolar 
drops out at the same time that the second or last premolar 
