Annals of the Transvaal Museum. 
77 
The Postorbitals. 
The general shape of these bones is the same as in latirostris. In 
the larger form they are of course more strongly built. The bone possesses 
a large and nearly vertical hinder surface (Pi. X), which corresponds 
with the much more inclined hinder surface and the upper end of the 
lower surface of this bone in latirostris. In latirostris the upper and outer 
surface is separated from the hinder surface by a protuberance ; in Put- 
terilli, however, the upper and outer surface forms acute ridges with the 
orbital surface and the hinder surface. The upperand outer surface con- 
tinues till near the postfrontal. The orbital surface and the hinder sur- 
face converge downwards, giving the bone the shape of a thin wedge. 
The postorbitals form high ridges along the parietals. 
Dimensions : 
Distance between the two ends of the postorbital 151 mm. 
Greatest height of the orbital surface 33 mm. 
Breadth of the upper and outer surface 17 mm. 
Mutual distance of the front ends of the postorbitals. . . 222 mm. 
Mutual distance of the hinder ends of the postorbitals.. 112mm. 
(This is double the distance between the hinder end of the left 
postorbital to the hinder end of the mutual suture of the parietals ; the 
hinder end of the right postorbitai is still covered by matrix.) 
The proportion of the two last dimensions is in Putterilli as 2 to 1 
and in latirostris as 2,7 to 1. In Putterilli therefore|the distance between 
the hinder ends of the postorbitals is not only absolutely but also relatively 
larger than in latirostris. 
It will be seen that the skull of Mccaigi is much narrower across the 
lower ends of the post orbitals than Putterilli. 
The Preparietal. 
The sutures around the preparietal are not clearly visible, and con- 
sequently the dimensions cannot be given accurately (Pi. XI). The 
upper surface, which is the k only one visible, is strongly concave antero- 
posteriorly and less so in any other direction. The suture with the frontals 
is marked by a broad, thick ridge. This ridge does not protrude above 
the level of the parietal foramen and the hinder end of the mutual suture 
of the frontals. As in latirostris the preparietal is situated wholly behind 
a line which connects the upper and hinder corners in the edges of the 
orbital cavity. 
The parietal foramen is oval-shaped. 
Length of the preparietal, probably 40 mm. 
Breadth of the preparietal, probably 35 mm. 
The Parietals. 
Only the upper surfaces of the parietals are visible, and their delimi- 
tation is not clear. The smallest breadth of the upper surface of both 
parietals is 44 mm., which is much more than twice that breadth in 
latirostris. 
