144 Annals of the Transvaal Museum. 
on the distal end. The broad central ridge terminates at about one-third 
of the length of the bone, above the hinder or lateral ridge of the shaft. 
The tibia has little more than half the length of the femur. Its 
proximal end is thick, the ventral-dorsal dimension being much larger 
than the transverse one. Along the anterior surface of the proximal end 
there is a groove, which corresponds with the intercondylar groove of the 
femur. The greater part of the rough articulation surface articulated with 
the lower condyle of the femur, but a small part found itself opposite the 
upper condyle. The shaft is thin and has a squarish section. The distal 
end is only slightly thicker than the shaft. The posterior surface is flat, 
while the upper and lower and the anterior surface are slightly concave. 
The FIBULA is a flat bone of the same length as the tibia. The 
proximal and distal ends are both broad and of the same thickness as the 
shaft. The anterior border is strongly concave, while the posterior border 
is nearly straight. The articulation surface of the proximal end looks 
obliquely downwards. The distal articulation surface makes a long curve, 
the inner and outer ends of which are thickened. 
The TARSUS is only partially ossified. Mostly five bones are present, 
three proximal bones and two tarsals. The three proximal bones are an 
intermedium, a fibulare and a centrale or tibiale, while the tarsals may be 
the first and the fourth. A sixth bone may be present between the first 
tarsal and the large centrale, being also a centrale. The intermedium is 
large, with a thickened articulation-face for the fibula, a slightly shorter 
face opposite the tibia and a thickened distal face for articulation with the 
large centrale. Externally it slightly touches the fibulare. The fibulare 
is transversely elongate with thickened sides. Proximally it articulates 
with the outer thickening of the distal end of the fibula, internally and 
proximally slightly with the intermedium, distally with the fourth tarsale 
and between this and the intermedium with the large centrale. Its distal 
surface opposite the fifth digit must have articulated with the cartilageous 
fifth tarsal. The large centrale is the largest bone in the tarsus. There 
was still some doubt whether this could not be a tibiale, but its central 
position, occupying the whole distal border of the intermedium, together 
with its being in touch with the fibulare, compelled me to take it as a 
centrale. This centrale is transversely elongate, its inner end being at the 
same time much broader than its outer end. It articulates proximally 
with the intermedium, externally with the fibulare and distally on the 
inner side through the second centrale with the first tarsal. The tibiale 
and the first, third and fifth tarsals appear to have not been ossified. It 
could not be made out whether there might have been more than two 
central ia. 
The digits give an impression of more strength than those of the 
fore-limb. They are thicker and slightly longer and the whole foot 
generally is broader. The first metatarsal is very short and broad, 
especially the ends attaining great breadth. Its first phalanx is also short 
and broad and the same can be said of the second phalanx, which is the 
stoutest end-phalanx of the lot. The second metatarsal is much longer 
than the first and its extremities are less expanded. The first phalanx of 
the second digit is longer than that of the first" and it is but slightly 
constricted in the middle. The second phalanx is longer than that of the 
first digit though not so broad. The third metatarsal is just as long as or 
slightly longer than the second, but it is less constricted in the middle. 
The first phalanx is longer and stouter than that of the second digit. The 
second phalanx is much smaller than the first, its breadth being about 
