S2 
PROFESSOR OWEN ON THE FOSSIL MAMMALS OF AUSTRALIA, 
the collection of interesting and instructive specimens brought home from the Circum- 
navigatory Voyage of Her Majesty’s Ship ‘ Galatea,’ under the command of His Royal 
Highness, and exhibited in the South Kensington Museum. The molar teeth in this 
fossil are in a more perfect state of preservation than in any other Nototherian jaws 
which had previously come under my observation ; and, being from an individual of the 
same age as that to which the jaw and teeth of Nototherium Victories from South 
Australia belonged, they exemplify more plainly and completely the differential cha- 
racters of that species and of the Not. Mitchelli from the Province of Queensland. 
The teeth (m 1, 2, 3) of Nototherium Mitchelli differ from those of Not. Victoria; in the 
presence of a “ cingulum” on the outer side of their base (comp. figs. 2 & 3, c, Plate XI. 
with figs. 4 & 5, Plate X.). In m 1 the cingulum is continued from the prebasal ridge 
(fig. 2,f) along the base of the anterior lobe to the outer tubercle (h), closing the valley, 
upon the outer surface of which the cingulum subsides; but it resumes its course behind 
the tubercle along the outer side of the posterior lobe (b), where it is continued upward 
along the middle of that side ; but from the base of this vertical prominence (cl, fig. 2, 
Plate XI.) the cingulum is continued to the postbasal ridge (g), which, like the prebasal 
one, is a more developed part of the cingulum. In Nototherium Victories the cingulum 
is represented only by the pre- and postbasal ridges (Plate X. figs. 4, 5, 6,/, g), and by 
the closing tubercles (ib. h, h') before mentioned (p. 77), at the outer and inner ends of 
the transverse valley. The penultimate molar (m 2, Plate XI.) presents the same differ- 
ential characters. In m 3 of the present specimen of Nototherium Mitchelli the vertical 
continuation from the cingulum upon the outer side of the hinder lobe is not present 
(Plate XI. fig. 2, ms); but in Not. Victories the outer closing tubercle (Plate X. fig. 4, 
m 3, h) and the postbasal ridge (ib. g) are both extended, converging, to curve up along 
the outer side of the hinder lobe of m 3, without crossing its base, as does the cingulum 
(Plate XI. fig. 2, m 3, c) in Not. Mitchelli. All the molars in Not. Victories differ from 
those in Not. Mitchelli by the greater breadth or thickness of the postbasal ridge. — 
July 23, 1872.] 
