208 Dr. G. Krefft on Fossil Kangaroos. 
kangaroos invariably do about that period. Figure 1, repre- 
senting the skull with a front tooth lost, proves, first, that the 
author had not the material required ; otherwise a more perfect 
figure would have been given; it also shows that the value of 
the upper incisors as a means of classification is reduced with 
age, because the incisors, being much worn, lose their original 
shape completely. 
On plate xxv. fine illustrations are given of Protemnodon 
Anak—that is, of a gigantic wallaby who kept his teeth and 
ground them down, but did not shed them as kangaroos do ; 
this is, of course, a member of the genus Halmaturus, as we 
have hitherto classed the tribe. Suppose we designate this 
creature as Halmaturus (Protemnodon) Anak. It appears, 
from remarks on page 261, that the author desires to retain 
the genus Osphranter ; but a definition of the characteristics of 
the genus are not given. Mr. Gould founded it on external 
characters only ; and not having a skull at my command, par- 
ticulars cannot be furnished. There is no doubt that walla- 
roos identical with the present wallaroo which inhabits the 
Clarence district, once existed and left their remains in the 
Wellington caves; Professor Owen mentions their presence 
on the Darling Downs also. 
The genus Phascolagus is mentioned as being found in a 
fossil state by Dr. Bennett in Queensland. This form occurs 
living far north, where Mr. George F. Waterhouse, of the 
Adelaide Museum, obtained the typical specimen. It appears 
to be a link between the wallabies and kangaroos proper, the 
head being long ; but the third upper incisor is a narrow tooth, 
and therefore the animal does not correspond with the kan- 
garoos proper, which have broad third upper incisors. The 
genus Bortogale is referred to in several places on pages 263 
and 264, founded on anatomical points of the skull, which 
cannot be distinguished without specimens. As far as I can 
remember, the teeth resemble those of the wallaroo. The large 
fossil wallaby, hitherto known to us as Macropus (or Halma- 
turus) Atlas, is now classed under the designation of Sthenurus 
Atlas. This is also a true wallaby, the form of whose lower 
premolar teeth approaches those of certain extinct phalangers 
of the genus Notothertwm. Several new species of each genus 
are described in the treatise, which can be referred to at the 
Public Library. 
_ ‘The next part of the learned author’s work will probably 
bring the kangaroo tribe to a close; and we may confidently 
expect to see figured therein some of the well-preserved spe- 
cimens forwarded by Dr. Bennett during the last six months. 
Surveying the part as a whole, it must be considered a 
