Stewart. J Cretaceous Fishes. 3 





teeth extending backward for three or four centimeters from the 

 extremity, which are followed by a series of much smaller ones 

 occupying the inner side of the bone and extending backward 

 to near the posterior extremity, where there are usually one or 

 more teeth much larger than any of the others. Near this point 

 those on the internal side become very small. The bone called 

 maxilla by ("ope is probably a pterygoid. It is short, bar-like, 

 and bears a single row of teeth, which decrease in size poste- 

 riorly. The posterior extremity is edentulous and somewhat 

 expanded. 



Palatine: Length to large posterior tooth 86 mm. 



Greatest height 25 " 



Transverse distance across alveolar border near cen- 

 ter 11 " 



Pterygoid (?) : Length (estimated) 67 " 



The dentaries are very much elongated and contracted regu- 

 larly toward the symphysis, where the bones are very shallow. 

 The symphysis is not very deep, consisting, for the most part, 

 of a small fiat facet on the internal side which meets its fellow 

 on the opposite side, and to which it is probably united in a 

 manner somewhat similar to that found in Pachyrhizodus . 

 Cope™ describes this part as presenting a marked fossa which I 

 am unable to find in any of our specimens, and I think it not 

 at all unlikely that this was an individual peculiarity of his 

 specimen. The alveolar border supports two series of teeth, of 

 which the internal are the larger of the two. There are usually 

 about ten teeth present in this series, and room for probably as 

 many more, which are often represented by the tooth scars of 

 the shed teeth. These teeth are set upon hemispheres of bone 

 firmly anchylosed to the jaw. The teeth are compressed, finely 

 striated, and directed inward. The external series consists of 

 several rows of teeth of which those on the internal row are the 

 larger. They are all directed inward and seem to have both 

 anterior and posterior cutting edges. Toward the posterior 

 extremity both series fade out, leaving a considerable space 

 between the last tooth and the end of the bone. The external 

 surface of the dentarv is covered with deep longitudinal sulci, 



90. Cret. Vert, Weet, p. 231. 



