SKULL OF A PARIASAURIAN REPTILE. 163 
the inside of the skull, and no errors of any morphological 
importance can possibly be introduced by the method of figuring 
I have employed here. 
Text-figure 5. 
i PLFr 
The skull of “ Pariasawrus,’ Hottentots Rivier specimen, X 3. Side view. 
Reference-letters as pefore. 
The most striking features of the skull pattern are :-— 
1. The very large size of the parietals, frontals, and nasals. 
2. The very reduced postfrontal wedged in between the 
frontal, prefrontal, parietal, and postorbital. 
3. The very great downward extension of the prefrontal, so 
that it nearly reaches the jugal. 
4, The fact that, as is usually the case in primitive reptiles, 
the lachrymal enters into both the nostril and the orbit. 
5. The shallowness of the maxilla. 
6. The fact that the quadratojugal meets the maxilla. 
7. The large size of the postparietal and tabulare, which are 
placed immediately behind and in the same plane as the parietal 
and postorbital. 
8. The reduction of the bones in the temporal region to one 
on each side. 
Description of the Attachment of Bones of the Cranial Roof 
to Underlying Bones. 
Postparietal.—The two postparietals fuse in the middle line, 
no suture being visible. Their posterior edge projects freely at 
the back of the skull, and the top of the supraoccipital is 
tightly fused on to their lower surface near the front. 
Parietal.—The parietals completely surround the pineal fora- 
men, which is of moderate size. Near their posterior border they 
are in contact with the supraoccipital, and further forward with 
the sphenethmoid. 
11* 
