54 



MR. D. M. S. WATSON ON THE 



be seen in the little median boss, and it is probable that the 

 median element of the internarial bar has terminated in it. 



The vertically standing part of the palatine, which forms the 

 side-Avail of the groove just described, descends to the level of the 

 lower border of the maxilla., where it passes into a flat, thick, 

 horizontally lying plate, which extends outward to the lower edge 

 of the maxilla with which it has a suture. 



This horizontal part of the palatine forms the greater part of 

 that bone, and extends backward and forward in contact with the 

 maxilla, until by narrowing and increasing in depth it becomes 

 converted into a mainly vertically disposed plate, which forms 

 part of the side-wall of the posterior part of the very large 

 internal nares. It then terminates, 



Text-figure 13. 



Scymnognathiis whaitsi Broom. 

 Reconstruction of internal aspect of the left side of the snout cut through in the 

 middle line. Internarial har and ossification in the nasal septum unshaded 

 and surrounded by a thick continuous line ; anterior end of the pterygoid 

 represented by a line of small crosses. Parts of palatine seen through other 

 hones in broken line. Reconstructed from the sections of 49369, checked 

 by R. 4052. X f- 



Thus the anterior part of the palate is essentially a flat plate 

 of bone, whose middle part is cut out by a narrow but gradually 

 widening groove which plunges steeply downward to the deeply 

 sunk posterior margin of the posterior nares. This groove is 

 divided into two by a narrow vertical septum, which descends 

 nearly to the level of the general plane of the palate. 



