Stewart | Cretaceous Fishes. 315 



The maxilla is short and deep, the depth not being as great 

 as in S. broadheadi. The alveolar border is nearly straight and 

 has alveoli for about thirty-one teeth, which are about the size 

 of those described in the above species. The posterior extrem- 

 ity cannot be examined, as there is a suborbital bone covering 

 this portion on each side of the skull, but it is probably very 

 similar to that of the figures of Saurodon ferox described below. 

 The superior border is sharp, and gives attachment to some 

 bone, probably a suborbital or jugal. The palatine condyle 

 seems to be very similar to that of S. broadheadi already de- 

 scribed. The bone, just above the alveolar border, presents a 

 somewhat shagreened appearance. Farther than this, there 

 seem to be no characteristic markings upon the external sur- 

 face. As the maxilla is firmly attached to the skull, the inter- 

 nal surface cannot be examined. 



The pre maxilla is plate-like, and nearly twice as deep as 

 broad. The superior border is irregular and presents no con- 

 dyle at this point. The external markings are very similar to 

 those found in Saurocephalus dentatus, and the bone is directed 

 more obliquely backward than in that form. The anterior bor- 

 der is directed sharply inward, giving the external surface of 

 the bone a very convex appearance. This border is very rugose, 

 probably for ligamentous union with its fellow T of the opposite 

 side. The alveolar border is very convex, and has alveoli for 

 twelve teeth, which are of about the same size as those on the 

 m axilla. 



Maxillary : Length of alveolar border (estimated i 82 mm. 



Depth at palatine condyle 33 " 



Number of teeth in one centimeter, 4. 



Premaxillary : Greatest depth 50 mm. 



Greatest length 30 " 



Length of anterior border 30 " 



In the mandible is found one of the chief characters that 

 separate this genus from Saurocephalus; instead of the upper 

 and lower jaws terminating at about the same vertical plane as 

 in the other member of the Saurodontida , the mandible projects 

 fully an inch beyond this point. The dentary is long and 

 Blender throughout; in Saurocephalus it is short and deep. 



