bels on the specimens.)

Sp. 2. Macropus titan. O. I gave this name to an extinct species, as
large as the preceding, but differing chiefly in the smaller size of the
permanent spurious molar; which in this respect more nearly corresponds
with the existing Macropus major. The remains of this species consist of
a fragment of the right ramus of the lower jaw. (II) Figure 3 Plate 47.

In both the above specimens the permanent false molar is concealed in its
alveolus, and was discovered by removing part of the substance of the
jaw, indicating the nonage of the individuals.

A portion of cranium with the molar series of teeth of both sides. (II)
Figures 4 and 5 Plate 47. This specimen I believe to belong to Macropus
titan.

The permanent false molar, which is also concealed in this upper jaw, is
larger than that of the lower jaw of Macropus titan, but I have observed
a similar discrepancy in size in the same teeth of an existing species of
Macropus.

To one or other of the two preceding gigantic species of kangaroo must be
referred:

II.a. Crown of right inferior incisor, Figure 6 Plate 47.

II.b. Lower extremity of right femur.

II.c. Lower extremity of right femur, with the epiphysis separated,
showing its correspondence in age with the animals to which the fossil
jaws belonged.

II.d. 5th Lumbar vertebra, Figure 8 Plate 47.

II.e. 10th or 11th Caudal vertebra. The proportion of this bone indicates
that these great kangaroos had a relatively stouter and perhaps shorter
tail than the existing species.

Macropus sp. indeterminate. Agrees in size with Macropus major, but there
is a difference in the form of the sacrum: the second vertebra of which
is more compressed--to this species which cannot be determined till the
teeth be found, I refer the specimens marked:

III. Sacrum.

III.a. Proximal end of left femur.

III.b. Proximal end of left tibia, in which the anterior spine sinks more
gradually into the shaft than in Macropus major. As this is the only
species with the skeleton of which I have been enabled to compare the
preceding fragments, I am not able to pronounce as to their specific
distinctness from other existing species of equal size with the Macropus
major.

Macropus sp. indeterminate. From want of skeletons of existing species of
kangaroo, I must also leave doubtful the specific determination of a
species smaller than Macropus major, represented by the left ramus of the
lower jaw (IV) in which