1903] 



Hay\ North American Cretaceous Fishes. 



73 



The anterior end of the mandible is broken away. Above 

 the palatine is the right premaxilla with about 23 teeth and 

 spaces for others. Between the upper and the lower thirds 

 of the figure lie the occipital bones and the frontals. The 

 left articular runs forward beneath the left palatine. The 



Fig. 53. Enchodus dolichus 

 Fig. 52. Enchodus dolichus Cope. No. 1837. X \. Cope. No. 1685. X 5. a'^«., den- 

 Disturbed skull, ii'ig.^ angular; art., articular; den., tary ; ec.pt., ectopterygoid ; yV., 

 dentary ; ec.pt. ectopterygoid ; fr., frontal ; op., oper- frontal ; tux., maxilla ; pal., pala- 

 cular ; pal., palatine ; p»tx., premaxilla ; gu., quadrate. tine ; piitx., premaxilla. 



right quadrate is displaced so that its articular surface (above 

 qu.) looks upward. 



Figure 53 represents No. 1865 of this Museum. This dis- 

 plays both palatines and their fangs ; the anterior end of the 

 ectopterygoid and two teeth; the lower jaw, with its fang 

 and teeth of two sizes; both premaxillae, with their small 

 teeth; and the anterior end of the frontal. Alongside of the 

 frontal is a fragment of a toothed bone which lies on a line 

 with the dental border of the premaxilla. It is probably a 

 portion of the maxilla. 



The palatine fang was missing in the type. No. 1837 

 shows, as Cope has already stated, that the palatine fangs 

 are finely striated on the outer surface. On the hinder por- 



