129 
Thus, in a pisiform of Phascolonus, the length and breadth are 
52 mm. and 33 mm. respectively as against 16 mm. and 10 mm. in 
the latifront species. 
FEMUR. 
|One nearly complete bone and a fragment comprising the 
lower end. | 
Length, 338 mm.; breadth (transverse width of upper end 
between head and great tzochanter), 152 mm. 
Wombat :—Length, 133 mm.; breadth, 43 mm. 
Diprotodontoid features are conspicuous in this bone. They are 
to be seen in the width of the upper extremity ; the egg- or pear- 
shaped outline of the head (when viewed proximally) owing to 
the production of its articular surface on to the neck ; the eleva- 
tion of the head to a considerably higher level than the summit 
of great trochanter, though not to the degree that obtains in 
Macropus; want of elevation of the lesser trochanter; the 
marked fore-and-aft flattening of the shaft and upper end, par- 
ticularly of the great trochanter; absence of the popliteal depres- 
sion, the plane of the hinder surface of the shaft being continued 
into the intercondyloid groove, and the anterior production of the 
fore part of the inner condyle. 
In the wombat the contour of the head, from the proximal 
point of view, is much more nearly circular, though there is here, 
too, some slight extension of its articular surface on to the neck,; 
the height of the great trochanter barely exceeds that of the 
head and it is less compressed ; the small trochanter forms a 
prominent and compressed ridge, and the shaft is nearly cylin- 
drical at its middle; the forepart of the inner condyle, though 
more prominent than that of the outer, is not produced, as in 
Phascolonus, into a sub-conical prominence. 
One feature common to both Phascolonus and Phascolomys is 
a shallow but distinct transverse groove which crosses the outer 
condyle at its junction with the rotular surface. In Diprotodon 
it is the inner condyle which is traversed by a similar groove. 
The third trochanter in Phascolonus seems to be represented 
by a rough oval tract situated on the post-axial side of the 
a little proximad of its middle. 
TIBIA. 
[Two almost perfect specimens of opposite sides and slightly 
varying size. | 
Length, 207 mm. and 198 mm. respectively ; breadth (of prox- 
imal end), 104 mm. and 101 mm. 
Wombat :—Length, 103 mm. ; breadth, 30 mm. 
The tibia exhibits, among other phascolomydian features, a very 
marked lateral compression but, in place of the deflection, fibulad, 
I 
