0G4 



UU. U. lillOOM 0\ TiJE STHUOTUJIK OF TUK SKULL 



There are five large incisors in each premaxilla. Tlie teeth 

 are not well enough preserved to show whether they were 

 pointed or had, like the front teeth of the Tapinocephaioids, ii 

 large basal keel. But there seems a little evidence in favour of 

 at least an expandeil base. The roots are very long. The fifth 

 incisor is directed more outwards than the others. Between the 

 fifth incisor and the canine is a fair-sized diastema in which the 

 lower canine lies when the jaws are closed. In the very large 

 majority of the Kairoo carnivorous reptiles the lower canine 

 passes into a deep cavity in front of the upper canine, but inside 

 the edge of the jaw. In Saq'tanodon there is no doubt that the 

 canine passed up outside the edge of the jaw, as portions of both 

 lower canines are preserved occupying the space between the 

 fifth incisor aiul the upper canine. 



Text-figure 2. 



Uppci' view" of sl;ull of Scapanodon diijolessisi Ihooni. About j nat. size. 



The upper canine is a large rounded tooth. 



The molars aie apparently 14 in number. The anterior are 

 the largest, and they steadily decrease in size in passing back- 

 wards. 



The nasal bones are completely weathered away, and the 

 frontals badly Aveatliered and largely gone. Enough is left to 

 show the np2)er margin of the orbit. From the structure of the 

 parts of the frontal remaining it is probable that there was a 

 considerable thickening of the bones in the frontal region. 



Though portions of the prefrontals and lachrymals remain, the 

 limits of these bones cannot be made out. 



The jngal bones ai'e, however, well preserved, that of the right 

 side being practically pei'feet. In front it passes well forwards 

 above the posterior end of the maxilla. It forms the whole of 



