MACROPUS Shaw.
Sp. 1. Macropus atlas. O. This must have been at least one-third larger than Macropus major, the largest known existing species: it is chiefly remarkable for the great size of its permanent spurious molar; in which respect it approaches the subdivision of Shaw's genus, called Hypsiprymnus by Illiger. The remains of this species consist of a fragment of the right ramus of the lower jaw. (I*) Figure 1 Plate 47.
(*Footnote. The numbers and letters within a parenthesis in this letter refer to labels 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.
PLATE 47: FOSSIL REMAINS AND RECENT SPECIMENS:
FIGURE 1, BELONGING TO Macropus atlas, AND
FIGURE 2, TO THE LARGEST RECENT SPECIMEN.
FIGURES 3, 4, AND 5, TO Macropus titan.
FIGURE 6, THE INCISOR OF A FOSSIL KANGAROO.
FIGURE 7, THE INCISOR OF THE LARGEST NOW KNOWN.
FIGURE 8, FOSSIL LUMBAR VERTEBRA.
From Nature and on Stone by Major T.L. Mitchell. J. Graf Printer to Her Majesty.
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.