BY C. W. DE VIS. 
127 
side of the middle of its edge, the mid-point being the termination 
of a rib on the outer side; the intero-posterior cusp is as yet 
obscurely denned; in a somewhat older example the crown is 
thickened and rounded at each end, two ribs appear on the outer 
side, and the intero-posterior cusp is more distinct; when near 
emergence the tooth gains greater robustness, and the cusp 
becomes exserted from the lobe. 
Molars (PL xvm. fig. 9) undistinguishable from those of M. 
magister. 
The undulation of the lower contour line of the mandible is 
well marked. 
Rise and fall of teeth. 
Of this little is known; p. 4 is newly arisen, and p. 4 is not 
entirely up when the hind lobe of m. 3 is coming into use; by the 
time that the hind lobe of m. 4 gets into wear, p. 4 is moderately 
worn and procumbent, whence we may infer that it is thrust out 
soon afterwards while still serviceable. 
Examples — -fifty-four. 
These include besides the young maxilla forming the t}^pe — 
Four adult maxillae; two with premolars, and all with m. 1 among 
the teeth preserved; twelve others in which m. 2 shows its cha- 
racteristic more or less perfectly: one with m. 3 , m. 4 ; one with m. 3 ; 
and one with m. 4 referred to the species merely on account of 
similarity of size. 
In four adolescent mandibles the well-preserved premolars 
alone effectually prevent the molars behind them being ascribed 
to M. magister, as they might otherwise have been on seemingly 
sufficient grounds, and well illustrate the folly of positively 
identifying kangaroo mandibles by molars only. Twenty-seven 
others are provisionally determined by the dimensions of the 
teeth. 
Macropus faunus, n.s. 
Molars with curved crests, rounded angles and strong links. 
Upper premolar tricuspid, without ledge on the inner side, but 
with an intero-posterior member simulating the corresponding 
