352 



DK. R. BROOM ON SOME NEW 



directed mainly anbero-posterioily. The posteiioi- two incisors 

 are more rounded. 



Tlie septomaxillary is large, and forms the lower border of the 

 nostril, but does not extend far backwards between the nasal and 

 the maxilhi. The foramen, usually present between the septo- 

 maxilla aiid maxilla, is small. 



The nasal bone is exceptionally large and broad. In front it is 

 crashed down on the nostrils and the details of structure cannot 

 be made out, but doubtless the arrangement is similar to that in 

 typical Therocephalians. Posterioi-ly the nasal meets the frontal 

 a little in front of the plane thiough the centre of the orbit. 

 The shape of the bone will be best understood from the figure. 



The maxilla is a short but powerful bone. It overlaps the pre- 

 maxilla to between the roots of the ord and 4th incisors. It has 

 one large canine which measures 20 mm.X 12 mm. Behind the 

 canine only a very small part of the maxilla shows on the palatal 

 aspect, and in the specimen there are no teeth, but on each side 

 there are indications of two old sockets with a possible third very 

 small one ; and I think we may assume that there were three 

 molars, of wdiich the 3rd w^as small. The three would measure 

 about 19 mm. The upper dental formula, would thus be i.^, c.\ m.^ 



The prefrontal is relatively small, and wedged in between the 

 nasal and frontal al)Ove and the maxilla aiid lacrimal below. 



The lacrimal is slightly larger than the prefrontal, and it forms 

 most of the front of the orbit. Near the middle of the bone and 

 on the orbital margin is a well-developed l)ony boss, and on the 

 inner side of this and near its upper end is a large lacrimal 

 foramen. 



Very little of the jugal is preserved, but the part underneath 

 the orbit forms with the maxilla a veiy deep and powerful sub- 

 orbital arch. 



The frontals are large and wide, as seen in the figure. 

 There is no postfrontal. The postorbital lies on the frontal 

 and parietal. 



The parietal crest is narrow as in typical Therocephalians, but 

 the pineal foramen is rudimentaiy. 



The palate is beautifully preserved and remarkably interesting. 

 The palatal portion of the premaxiilaries has not been displayed 

 as the matrix is required to support the fragmentary incisors. 



The prevomers form a large part of the bony roof of the mouth. 

 In front they are anchylosed and form a wide plate between the 

 internal nares. At the back part of the nares they are much 

 constricted, but beyond this widen out again into a fan-shaped 

 structure which lies between the palatines and meets the ptery- 

 goids. In this back part a median suture between the two 

 prevomers is very distinctly seen. 



The palatine is a large and powerful bone. Externally it has 

 a long articulation with the maxilla, and here the palatine is so 

 thickened that it forms more of the wide alveolar surface than 

 does the maxilla. In front and nearly on the plane of the back of 



