Osteology of the Marsupialia. 273 
This difference in the size of the supra-tympanic cell is obviously 
not the effect of age, as the skull of the Phase. Vombatus com¬ 
pared is that of an old animal with strong temporal ridges. 
In Phase, latifrons the articular surface for the condyle of the 
lower jaw is broader and less convex; the anterior boundary of 
the zygomatic space is less angular; the palatal surface of the 
intermaxillaries is deeper; the curve of the lower border of the lower 
jaw is much deeper; the coronoid process (ib. cr) is higher and 
narrower, and the post-symphisial depression is almost obsolete. 
The geographical distribution of Australasian Marsupialia is 
shown in the following Table :— 
SPECIES OF MARSUPIALIA. 
Peculiar to 
Common to both. 
Australia. 
Van Diemen’s Land. 
Dasyurus Geoffroyi. 
hallucatus. 
Phascogale crassicaudata. 
macroura. 
murina. 
albipes. 
leucogaster. 
flavipeg. 
apical i*. 
calura. 
penicillata. 
Myrmecobius fasciatus. 
Choeropus castanotis. 
Tarsipes rostratus. 
Perameles Bougainvillei. 
myosurus. 
fasciata. 
nasuta. 
macroura. 
lagotis. 
Acrobata pygmaja. 
Petaurus Ariel, 
breviceps. 
sciureus. 
australis, 
taguanoides. 
Phalangista Neillii. 
concinna. 
canina. 
xanthopus. 
vulpina*. 
Hypsiprymnus (proper). I 
species. 
(Bettongia),4 species. 
(Potorous),3 species. 
Macropus (Heteropus), 4 
species, 
(Lagorchestes),4 spe¬ 
cies. 
(Halmaturus),16 spe¬ 
cies. 
(proper), 3 species. 
Phascolomys latifrons. 
Thylacinus cynocephalus. 
Dasyurus ursinus. 
maculatus. 
Phascogale leucopus. 
minima. 
Swainsoni. 
Perameles Gunnif. 
Phalangista nirna. 
fuligino.a*. 
Hypsiprymnus (Bettongia) 
cuniculus. 
Macropus (Halmaturus) 
Billardieri. 
(Halmaturus) Ben- 
nettiif. 
Dasyurus viverrinus. 
Perameles obesula. 
Phalangista Cookii. 
Macropus major. 
Phascolomys Vombatus. 
| 
* Phal. vulpina and Phal.fuliginosa may prove varieties of the same species, 
t Mr. Waterhouse, from whose excellent “ Natural History of Mammalia” the species arc 
cited, regards this ns a variety of the Halmaturus rnficollis of Australia. 
