342 Case a?id Williston — Description of Reptilian Skulls. 



attached to the maxillaries throughout their length ; there is 

 no palatine vacuity. The position of the palatine-pterygoid 

 suture can not be made out. The anterior portion of the 

 inner edge of the palatine is applied to the outer surface of 

 the prevomers, the attachment being by overlap. There are 

 no teeth on the palatine. 



Pig. 1. 



Fig. 1. Palate of Diadectes lentus Marsh. x £. Mus. University of 



Chicago. 



The pterygoids are slightly convex upwards in the anterior 

 portion ; the inner edges of the two bones meet, if at all, at 

 the anterior ends, leaving an elongate vacuity which widens 

 posteriorly. It is uncertain whether the anterior ends of the 

 pterygoids meet or whether the vacuity is closed by the union 

 of the prevomers (vomers). The edges of the pterygoids form- 

 ing the sides of the median vacuity are lined with small teeth 

 and the flat surface of the bone adjacent to the posterior part 

 of the vacuity is covered with small shagreen-like teeth. The 



