162 MR. D. M. S. WATSON ON THE 
otherwise in contact with the quadratojue 
a al and s 
throughout its whole height. : oe es 
The body of the bone passes gradually into a powerful pterygoid 
ramus, which covers nearly the whole of the posterior ramus of 
the pterygoid. 7 
The upper border of the bone is covered by a special process of 
the squamosal. 
Text-figure 4. 
The skull of “ Pariasaurus,’ Hottentots Rivier specimen, X %. Dorsal aspect. 
The sutures have only been seen on the inner surface and are drawn here on the 
assumption (apparently justified by the specimen) that they pass through 
at right angles to the surface. The part to the left of the thick dotted line 
is not preserved in the specimen. 
Fy., Frontal; Ju., Jugal; Lac., Lachrymal; MMyv., Maxilla; Nae., Nasal; P.Par., 
Postparietal ; Po., Postorbital: P¢.Fr., Posttrontal; P7.Fr., Prefrontal ; 
Par., Parietal; Qu., Quadrate; Qu.J., Quadratojugal; Sqg., Squamosal ; 
Tab., Vabulare. 
Roof of the Skull—The general structure of the roof of the 
skull will be more readily understood from text-figs. 4 and 5 than 
from any description. It must, however, be remembered that all 
the sutures shown in these figures have been seen only on the 
inside of the skull, their positions on the outside being drawn on 
the assumption that the sutures pass straight through at right 
angles to the surface; observations on fractures show that this is 
really the case. It is impossible to give an intelligible figure of 
