296 ^Ir. D. ^r. S. Watson on 



surface of tlic skull. Tliis groove inclines slightly outwards 

 at its lower end. 



The whole of the lateral part of the posterior surface is 

 formed by the base of the zygoma, and consists of an outer 

 area curved from above downwards but flat from side to 

 side, "which forms the anterior wall of the groove spoken of 

 in describing the side view. The inner and posterior sides 

 of this groove are formed by a powerful flange of bone, 

 ■whose other face forms the outer side of the V-shaped notch 

 separating the median from the lateral part of the occipital 

 plate. 



The most striking feature of a ventral view of the skull is 

 the small size of the palate. The posterior nares are of very 

 large size, being both wide and deep ; they are bounded 

 below by the posterior edges of the secondary palate, which 

 is formed by the ingro^^th of ridges from the almost vertical 

 anterior plates of the palatines. 



The two rows of flattened teeth are nearly parallel ante- 

 rioily, but separated widely on each side of the posterior 

 nares. The hinder border of the secondary palate is con- 

 tinued by a ridge which passes backwards to the level of the 

 last molar, Avhere it subsides into the general level; just 

 external to it at this point is a small suborbital foramen. In 

 this region the teeth are carried down on a ridge of the 

 maxilla below the general level of the palate. Just behind 

 this region are two enormous descending flanges, with flat 

 outer surfaces, which during life were eloselv applied to the 

 inner surface of the lower jaw. 



Between the flanges the palate is divided into three 

 grooves, separated by rounded ribs. These ribs approach 

 one another as they are traced backward, becoming at the 

 same time more distinct and narrower, and finally ending 

 between the descending flanges in a pair of well-marked 

 processes. 



The median groove is divided by a thin rib, which rises in 

 front to become a deep but still very slender plate, partially 

 dividing the posterior nares. The two lateral grooves each 

 contain a small foramen. 



Behind the flanges the palate becomes very narrow, 

 forming a bar bearing on its lower surface a strong ridge 

 which separates two snuill grooves which lead anteriorly into 

 the lateral channels of the [lalate. 



On the outside of tlicsc grooves lies a pair of rounded 



