O. P. Hay — Species of Saurocephalus. 



301 



which spans thirteen teeth in the maxilla spans ten in the 

 den tar j. At the proximal end of the mandible there must 

 have been a process of the dermarticulare, as in related forms ; 

 but in the specimen figured it is hidden by the overlying 



Fig. 2. 



ceratohyal, which is not shown in the figure. At the anterior 

 end of the mesial face of the dentary there is found a broad 

 surface, rough with processes and pits, an indication that the 

 two dentaries were strongly bound together. The extreme 

 anterior end of each dentary is occupied by a surface to which 

 was evidently attached such a predentary as Stewart has de- 

 scribed as belonging to several related species. A groove and a 

 row of foramina are present on the median face of the dentary. 



Length of alveolar border 112 mm 



Length of mandible from cotylus.. 130 



Depth of mandible at last tooth 56 



Depth of mandible at symphysis .. 34 



Fig. 3 represents, five-eighths the natural size, the pterygo- 

 palatine arch seen from within. A triangular piece is missing 

 from the anterior end, and the lower end of the ectopterygoid, 



Fig. 3 x | Fig. 4. x £ 



mt.pg. s 



pg, is defective. A.s I interpret the bones, the arch is remark- 

 able for the large size of the palatine, pa. While the sutures 

 which are represented in the figure are very distinct, I am 

 wholly unable to find one separating the entopterygoid, ep, 

 from the metopterygoid mt. pg. On the upper border of the 



