Tertiary. | PALZONTOLOGY OF VICTORIA. [ Mammalia. 
the hind-lobe downwards, outwards, and backwards to the base, defining a deep 
oblique cavity on the back of the hind-lobe; (in S. Aélas there is only a slight 
ostbasal ridge and an ill-defined shallow concavity). m* is one line longer in 
M. Titan than in S. Atlas, with the same breadth. The mid-link of m? is more 
curved than in m?, the concavity inwards. Length of p*, 5 lines; of d+, 5 lines; 
of m', 6 lines; of m?, 8 lines; of m*, 8 lines; width ot d*, 5 lines; of m!, m?, m’, 
6 lines. 
Lower jaw or mandible has the adult series of d*, and three molars 2 inches 24 
lines long; m’, 8 lines long and 6 lines wide, stands well in advance of the anterior 
edge of the coronoid process (more so with advancing age); prebasal ridge large, 
standing up like a lobe, nearly as wide as the tooth, and to level of hind-lobes 
of preceding tooth; fore-link strongly developed, joining the anterior lobe on the 
outer side of the mid-line defining a deep depression on each side (in S. Atlas this 
link is only rudimentary); mid-link also a little on outer side of mid-line, so that 
the inner hollow is larger than the outer, the middle projecting inwards as a salient 
angle or projecting lobe ; the thickened posterior sides of posterior lobe with a small 
deep conical pit a little on inner side of the mid-line m? like m, each about 8 lines 
lone and 6 lines wide; m! is 6 lines long and 45 lines wide, with a strong lobe-like 
prebasal ridge standing as high as the posterior lobe of d*; fore-link strongly 
developed, nearer to the outer than the inner end of the fore-lobe and prebasal ridge, 
curved, the projecting angle directed inwards; the valley between the prebasal 
ridge and fore-lobe is divided by the link into two hollows, the inner one larger 
than the outer one; the inner edge of the prebasal ridge is sharp, the outer edge 
thicker. The mid-link joins the anterior lobe at a greater depth below the edge 
than in the prebasal ridge and fore-link; the edge of the fore-lobe is slightly curved 
with the convexity backwards. The long diastemal edge between the base of the 
anterior molar and the incisor is sharp, and descends rapidly with a parabolic curve 
from anterior molar to vertical over dental canal, continuing thence, as a straight 
sheath, to the incisor. From back of m® to tip of incisor 6 inches 2 lines. The long 
incisor is procumbent or directed forwards with a very slight upward inclination ; 
length of grinding surface 1 inch 1 line, width 4 lines, depth of incisor 5 lines. 
Depth of jaw behind m* 1 inch 6 lines, the same at vertical to interval between m? 
and m!; vertical to front of dental canal, 1 inch. (Professor Owen’s figures are 
more slender, but his measurements of a similarly old jaw are the same.) 
REFERENCE.—Owen, in Mitchell’s Three Expeditions into the Interior of Hastern 
Australia, &e., p. 366, t. xlvii., and Catalogue of the Fossil Mammalia, &e., in 
Museum of College of Surgeons, p. 82+; Phil. Trans. Royal Society of London, 
vol. 164; Extinct Mamm. Aust. p. 485-42, t. Ixxvi—Ixxix. p. 400-11, t. Ixxxi. 
fig. 6-9, t. Ixxxii. fig. 17, 18. 
This great extinct Kangaroo was first described by Professor 
Owen from Sir T. Mitchell’s collection of bones from the Wellington 
ossiferous caves of New South Wales, and seems to be equally 
common in Victoria, as I have recognized portions of it from 
Pliocene Tertiary deposits of many localities near Melbourne. It 
approaches in the character of its teeth more nearly to the common 
south coast ‘Old Man” Kangaroo, Macropus major, than to any 
other living form, but is much larger ; it also has the palate entire 
(or without great vacuities), as in it. 
[6] 
