204 
PEOFESSOE OWEN ON THE FOSSIL MAMMALS OF ATTSTEALXA. 
PalorcJiestes Azael. OspJiranter rufus. 
in. lines. in. lines. 
Length from head to subsidence of procnemial ridge .7 6 5 3 
Fore-and-aft diameter at upper part of procnemial ridge 3 5 2 0 
Transvere diameter of shaft halfway down procnemial 
ridge 17 10 
Span of excavation between procnemial ridge and fibular 
ridge 24 16 
Fore-and-aft diameter of head of tibia 3 10 2 8 
§ 7. PalorcJiestes (Calcaneum). — In Macropus {OspJiranter) rufus the length of the 
calcaneum exceeds the transverse breadth of the distal end of the femur by two sevenths ; 
the extreme breadth of the calcaneum is one third greater than that of the middle of 
the shaft of the femur. By these proportions I am guided in the choice of the two 
fossil calcanea (figs. 4 & 5, Plate 23), and refer the longer bone to PalorcJiestes. 
The length of the subject of fig. 5, Plate 23, exceeds the transverse breadth of the' 
distal end of the femur (ib. fig. 2) by two sevenths. The length of the calcaneum (ib. 
fig. 4) exceeds the transverse breadth of the distal end of the femur (ib. fig. 3) by one 
fourth. The breadth of the calcaneal process of fig. 4 is equal to that of the longer 
calcaneum, fig. 5. 
On the grounds subsequently to be adduced for concluding the leg and foot of 
Procoptodon to have been shorter in proportion to its length than in Macropus, I 
therefore assign the shorter and thicker calcaneum to that genus, together with the 
portion of femur (fig. 3), which shows more generalized characters, or those less strictly 
macropodal, than the femora assigned to PalorcJiestes, Macropus, and StJienurus. 
§ 8. Macropus Titan (Skull). — Of this species I am now enabled to add to maxillary 
and mandibulary evidences adduced in former Parts some instructive cranial characters. 
The specimen yielding these was found by W. F. Tooth, jun., Esq., at King’s Creek, 
near Clifton, Darling Downs, at a part of the bed which Dr. Bennett, F.L.S., had 
pointed out to his friend as being likely to yield fossils after a flood*. To these gentle- 
men the British Museum is indebted for the specimen. On receiving it as much of 
the adherent matrix was cleared away as could safely be meddled with ; and the present 
state of the fossil is given in side and base views, of the natural size, in Plates 25 
and 26. 
It is a great part of the skull of a Kangaroo, wanting the lower jaw, but including 
the cranium proper, the interorbital and the hinder part of the facial division of the 
skull ; also great part of the left zygomatic arch, with the included orbit and temporal 
fossa, the bony palate, and the molar dentition, of which the two hindmost teeth are 
sufficiently entire to afford the means of specific determination. 
Other projecting parts and processes have suffered fracture, and the region of the 
* See “ A Trip to Queensland in search of Fossils,” by Dr. George Bennett, F.L.S., in ‘ Annals and Maga- 
zine of Natural History,’ April 1872. 
