On the Reptilian Genera Euparkeria Broom and Mesosuchus Watson. 83 
symphysis, articulating posteriorly with the surangular and angular. The 
lower view of the ramus shows a splenial lying within the dentary forming 
part of the lower border of the jaw, passing back almost to the level of the 
front of the external mandibular foramen but not reaching the symphysis 
antet'iorly. Lying wedged between the lower half of the dentary and the 
posterior half of the splenial is the anterior prolongation of the angular. 
The angular forms the lower border of the external mandibular foramen, 
and the lower border of most of the hinder half of the ramus. The suran- 
gular lies dorsal to the angular, and extends from the dentary to the 
articular. Just anterior to the articular it has a fairly large nutritive 
foramen ; above the external mandibular foramen and just below the dorsal 
edge of the bone is a well-defined groove leading backwards to a small 
foramen ; and the upper edge of the bone is thickened to form a small 
flange. Lying below the posterior half of the surangular and apparently 
passing between it and the angular is a slight splint-bone which I take to be 
a prearticular. It is small. The limits of the articular are not well defined. 
At the actual articular surface it is bounded outwardly by the surangular, 
which passes back to lie outside the postarticular process. The articular 
surface is shallowly concave and broad for the reception of the broadened 
quadrate. I can see no evidence of a coronoid. 
The teeth, at least in the lower jaw, are serrated on their anterior and 
posterior borders, the posterior serrations being much the coarser of the 
two sets. I can see no definite trace of anterior serrations in the upper jaw, 
and some teeth are certainly without. 
Specimen No. 6 is of interest as showing a small fragment of the 
palate in association with part of the side of a skull. The specimen is 
somewhat unsatisfactory, but it is possible to identify the elements 
present. Most of the left orbital and preorbital region is preserved, and the 
front of the left ramus of the lower jaw ; the stone containing the specimen 
has split almost longitudinally, so that the inner face of the maxilla is seen on 
one piece and the outer side of the jugal on the counterpiece. Comparison 
of the lower jaw with the type shows that the specimen is not quite full 
grown. The lower jaw shows definitely that the splenial plays no part in the 
symphysis. The only real point of interest in the specimen is the evidence 
of small teeth on the palate. These are short, blunt, smallish teeth exposed 
in a row of four or five on a bone, which apparently articulates latero- 
anteriorly with the hinder part of the maxilla. The teeth begin behind the 
level of the orbit and are placed in the long axis of the skull. It is 
probable that they are borne by the pterygoid, as in the somewhat earlier 
form Proterosuclms fergusi. 
It should be noted that there is in the collection another fragment 
showing a portion of the maxilla with two thecodont teeth, serrated pos- 
teriorly ; and associated with it a bone of the palate carrying a row of eight 
