178 Transactions of the South African Philosophical Society. 
apposition the larger portion of the squamosal, and though the 
whole is slightly distorted it is not difficult to restore it to its 
original shape. 
As is the case in many Theriodonts and most Anomodonts, the 
skull is large in proportion to the limb bones, but is characterised by 
the slightness of its build and the slenderness of the arches. 
The frontal region is moderately developed and is somewhat 
concave both antero-posteriorly and transversely. The frontal 
bones articulate in front with the prefrontals and presumably with 
the nasals. Behind they articulate with the postfrontals and parietals. 
Only a comparatively small part of the supraorbital ridge is formed 
by the frontals. 
The postfrontal bone is of a remarkable form. It is shaped much 
like the letter ‘‘L’’—the longer limb forming the postorbital arch 
and the shorter resting on the parietal ridge. The inner half of the 
postorbital arch is unusually deep, and being markedly concave on 
the anterior side, forms not only the posterior wall of the orbit, but, 
as a continuation of the supraorbital ridge, forms to some extent a 
roof. The outer part of the postorbital arch is very slender. The 
shorter limb of the postfrontal lies quite at right angles to the larger 
limb. 
The parietal crest is narrow and deep. About midway between 
the inner end of the postorbital arch and the top of the occiput is a 
fairly large parietal foramen. ‘The parietals pass for a considerable 
distance outwards from the hinder part of the crest and meet the 
squamosals. 
The squamosal is a much more slender bone than in the 
Anomodonts, but is very similar in structure. Articulating above 
and internally with the parietal, it passes outwards and downwards 
—no doubt in contact with the supraoccipital and exoccipital—and 
sends forward a slender bar to meet the jugal and form the temporal 
arch. ‘The greater part of the bone, however, descends as a bony 
plate—convex posteriorly—and no doubt gives articulation to the 
quadrate. The greater part of the squamosal is fairly well preserved 
on the right side of the skull. 
In the anterior region of the skull most of the sutures are un- 
recognisable. The prefrontal is, however, readily distinguishable 
from the frontal. It seems to be rather a narrow element, though, 
as the suture between it and the lachrymal cannot be made out, it is 
impossible to say whether it or the lachrymal forms the larger part 
of the facial surface. It forms the anterior part of the supraorbital 
ridge. | 
The maxillary bone is well developed, and though it bears some 
