Annals of the Transvaal Museum 87 
26 mm. The impression of the lateral side of the bone shows some grooves 
and the bone must therefore have had fine ridges on this surface, indicated 
by the lines in fig. 5. 
A reconstruction of the pelvis shows a- remarkable feature. If the three 
bones are fitted together with the upper proximal corner of the pubis against 
the end of the processus praeacetabularis and the upper posterior corner of 
the ischium (its articulation surface) against the end of the processus post- 
acetabularis, then pubis and ischium can meet in such a way that the lower 
proximal corner of the pubis rests against the anterior portion of the upper 
border of the ischium, where the upper border rounds off into the anterior 
border of the bone. In this position both ischium and pubis would be greatly 
directed downwards and only slightly forwards and backwards if the line 
connecting the spinae is placed horizontally. However, the concave upper 
medial border of the pubis and the convex upper anterior border of the ischium 
suggest, in the light of the fact, that for example in Gryponyx africanus 
( 4 , p. 297) pubes and ischia form a complete symphysis right through, that 
in our case the connection between the two bones may have been greater. In 
order to find out whether this suggestion lay within the bounds of possibility, 
models were made in plasticine of the preserved shapes of the bones. As the 
thickness of the bones would have to be deduced by comparison with com- 
pletely known bones and as the thickness would not really affect the general 
argument, these plasticine models were made of uniform thickness. A recon- 
struction of the pelvis with the help of these models now showed, that if the 
ilea were placed so, that they diverged forwards and also slightly downwards 
and the pubes in a plane, it was possible to place the ischia in such a way 
that their upper anterior border nearly fitted into the concave upper posterior 
border of the pubes. There would be a complete fit if the lower anterior portion 
of the proximal plate of the ischium were bent slightly more inwards and the 
upper posterior corner of the pubis slightly more outwards. The whole fossil 
has suffered greatly from pressure and both ischia and pubes are lying flat in 
the slabs. It is therefore nearly certain that they have lost at least some of 
their original curvature. We may therefore conclude, that in this animal 
pubes and ischia had very probably a complete suture, from the distal end 
of the pubes to the distal end of the ischia. The distal ends, of both bones 
would then come still nearer to each other than was already assumed above. 
Femur. 
Both femora are present. The left one shows its hinder aspect, but only 
an impression of the front side of its distal end. The right femur is seen from 
the medial side. The bones are badly preserved, for both are more or less split 
in two and very much flattened. 
The length of the left femur is 137 mm. The breadth of the proximal end, 
measured from the tip of the caput femoris to the lateral end of the proximal 
surface, is 33 mm. Its thickness as shown in the right femur is 21 mm. The 
caput femoris projects far inwards. Its height at the medial end is 10 mm. 
At the extreme medial lower end of the caput there is a very small hooklike, 
downward process, which may perhaps be interpreted as the section of a rim 
along its lower border. The line of the proximal surface makes nearly a right 
angle with the lateral line. There is a slight thickening near the upper edge 
of the left femur, which may perhaps indicate the position of the trochanter 
minor. The centre of this thickening is situated at about 13 mm. from the 
medial end of the caput femoris. The trochanter major is not visible. Al- 
