86 
Annals of the Transvaal Museum 
between the lower end of the hooklike process and the bent down proximal 
medial corner of the pubic plate; its broad base lies more proximally, in the 
direction of the middle of the upper border of the bone. In the left pubis the 
lower end of the foramen is not so sharply pointed. The greatest breadth of 
both foramina is 8 mm. In the right pubis this breadth is situated at about 
4 mm. from its broad end, whereas in the left pubis this breadth is retained 
for a distance of 8 mm. from the broad end. The total length of the foramen 
is 1 8 and 21 mm. in the left and right pubis respectively. 
Ischium. 
Both ischia are preserved. Their condition, however, is very poor. Por- 
tions of the two bones are in both slabs. The contour of the right ischium is 
complete. 
The length of the bone is 102 mm. The bones are of course flattened, but 
the right ischium still seems to show that the 
and that the proximal plate as a whole is 
slightly bent outwards. The upper anterior 
edge of the plate is bent out farther than the 
upper posterior corner or the lower anterior 
edge of the plate. The proximal plate has a 
total breadth of 43 mm. Its posterior portion 
is thicker than its anterior portion. The medial 
surface of the proximal plate is concave an- 
teriorly; posteriorly the surface is not pre- 
served. The breadth of the process is 13 mm. 
At the anterior border the process is thin and 
at the posterior border it is thick. Distally 
the posterior border is straight; its proximal 
half is concave, except for a small portion 
near its upper end, which is convex. As the 
two bones were separated from each other 
before fossilisation and both of them are 
present in their full length, they cannot have 
been co-ossified at their distal end. The anterior 
border of the process is fairly straight. Just 
below the anterior border of the proximal plate 
it is concave. This point lies 37 mm. below the 
junction of the posterior with the anterior 
portion of the upper border. The anterior 
border of the proximal plate is very slightly 
convex. Proximally it bends gradually into 
the anterior portion of the upper border. There 
is no processus subacetabularis ischii. The 
upper border of the ischium consists of an 
anterior and posterior portion, which meet each 
other at an obtuse angle. The posterior portion 
makes an acute angle with the posterior border 
of the ischium. It is fairly straight, but at its 
posterior end it is slightly concave. This con- 
cave part corresponds with the articulation 
surface for the ileum. The anterior portion 
is straight in its upper part and rounds off into the anterior border 
of the ischium. The posterior portion of the upper border has a length of 
downward process is straight 
ischium, with impressions 
of its lateral side. About 
nat. size. 
