REPTILIA : SEYMOURIA 53 



teeth in each maxilla, though there may be one or two more or 

 less, the longest of them in the middle or front part; they are placed 

 close together and are evidently labyrinthine in structure. They 

 extend back nearly as far as the posterior inferior angle of the orbit. 

 The mandibular teeth cannot be made out in the closed condition 

 of the jaws. The mandibles are rather slender, meeting in a short 

 symphysis, curving broadly outward behind, and are broadest 

 below the posterior part of the orbit. The articular bone is pro- 

 duced very sUghtly. 



The occipital region of the skull is obscured by the articulated 

 vertebrae above and the clavicular arch below; I can say nothing 

 concerning it. And of the palatal region only the anterior part, 

 in front of the clavicles, is visible. Broili describes these regions 

 as follows: 



The basioccipital, showing only a comparatively small surface, has a well 

 formed, lightly convex occipital condyle. The basisphenoid has its lateral 

 processes considerably developed as keel-like elevations; anteriorly it is drawn 

 out into a pointed, dagger-like parasphenoid, projecting into the space between 

 the pterygoids. The anterior wing of the pterygoid is, at the beginning, gently 

 emarginate, forming the interval for the parasphenoid, but it soon unites with 

 the corresponding wing of the opposite side. The extent of the united ptery- 

 goids in front is considerable, though how great cannot be said because of the 

 imperfect preservation of the specimen. The posterior process of the ptery- 

 goids extends dorsalward in the region of the quadrate, forming on one side 

 the border of the inferior temporal vacuity, on the other taking part in the 

 formation of the otic notch. On the margins of the anterior processes of the 

 pterygoid which form the interpterygoid vacuity, as also on the elevation, there 

 are traces of small teeth;" but the preservation of the specimen does not permit 

 the determination of the number. 



In the present specimen only the very broad pterygopalatine 

 plates in front of the temporal vacuity have been exposed. They 

 slope upward on each side at an angle of nearly forty-five degrees. 

 The separation of the sutures, alike on the two sides, seems to 

 differentiate the pterygoids, palatines, and vomers. The palatines 

 are narrow, reaching, back only to the beginning of the decHvity 

 representing the transverse bone; the union between the vomers 

 and pterygoids is broad. I can distinguish no teeth of any kind 

 on any of the bones; doubtless they were present, though in all 

 probabiUty very small. 



