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PROFESSOR OWEN ON THE EOSSIL MAMMALS OF AUSTRALIA. 
These characters may be subsequently found in other individuals, and sufficiently evince 
an established variety ; but they are so strongly marked in the still larger mandibular 
fossils next to be noticed as to justify their ascription to another (zoological) species, 
and the imposition of the name which heads the present section. 
§ 12. Protemnodon Mimas , Ow. — In this species a greater depth and thickness of 
mandible and a concomitant larger size of molars are associated with a relatively smaller 
size of the trenchant premolar, which does not exceed that in Protemnodon Anak. Such 
character of the variable tooth might be expected, having regard to those which it 
exhibits in different species of existing Wallabies ( Halmaturus , Cuv.). 
In the present large extinct species of Protemnodon a marked modification of the 
molar teeth accompanies their relative proportions to the premolar, and confirms the 
taxonomic deductions as to specific status, but does not give ground for assigning thereto 
subgeneric value. 
The postbasal ridge (Plate XXVI. fig 3 ,g) though narrow is definite; the pre- 
basal ridge (ib. f) is proportionately as well developed as in Protemnodon Anak ; its 
“ link ” (ib. s) also, and that (ib. r) of the two chief lobes, are more distinct than in the 
type species. 
The smaller mandible and teeth (Plate XXV. figs. 7 & 8) cannot have come from a 
younger specimen of the present species ; both molars and premolars are more worn, 
and prove that fossil to have been derived from an older Kangaroo than the animal 
which owned the subject of the present description. 
The premolar of Protemnodon Mimas (Plate XXVI. fig. 1, p s) shows on the outer side 
of the intermediate part of its crown five vertical grooves and four ridges, more strongly 
developed than in Protemnodon Anak ; these are, in part, worn smooth on that side of 
the tooth of the subject of fig. 7, Plate XXV. For the rest, the characters of the pre- 
molar of the larger species are those of Protemnodon Anak. 
The crown of d 4 , figs. 1—3, has suffered more from fracture than abrasion. A linear 
tract of dentine is exposed in each transverse lobe of m i, slightly expanding at the 
origin of the “link” from near the outer end of their anterior surface. Only the 
enamel shows abrasion in m 2. The crown of m 3 is entire, has but recently risen 
into place, and, contrasted with that tooth in the subject of fig. 13, Plate XXV., 
exemplifies the coronal character of the molars of the present well-marked species. It 
is partially concealed in a direct outer side view by the coronoid process, q, fig. 1, Plate 
XXVI. 
For this fine evidence of Protemnodon Mimas I am indebted to my friend Dr. George 
Bennett, F.L.S., of Sydney, New South Wales, who obtained it from the freshwater 
deposits forming the bed of “ Gowrie Creek,” Darling Downs. 
From the same fertile district, but in another locality (Eton Vale), Sir Daniel 
Cooper, Bart., received and presented to the British Museum the portions of mandible 
(Plate XXIV. figs. 13 & 14, and Plate XXVI. figs. 4 & 5), little, if at all, exceeding in size 
the corresponding part of that of Macropus major or Macropus rufus. The best-preserved 
