^9<^3-^ 



Hay, North American Cretaceous Fishes. 



33 



between these overlapping ends are seen the edges of two 

 toothed bones, one in front of the other. Probably the one in 

 front is the vomer, the other possibly a part of the glossohyal. 



In front of the symphysis of the dentaries {den.) are seen 

 the premaxillag (pnix.) evidently pressed downward and back- 

 ward. They are ornamented as in the type. As shown in 

 the figure, the maxillae (nix.) join the premaxillae and form 

 the greater part of the border of the mouth. The lower 

 border is pitted, and some or all of these pits enclosed the 

 bases of teeth. There is also a pitted band on the outer sur- 

 face of the bone, above the tooth line. 



Through a splitting of the specimen a view is afforded of 

 the inside of the mouth. Fig. 21 is a view of the right-hand 

 side of the floor of the mouth seen from above; while Fig. 

 22 shows the right side of the roof of the mouth turned up- 

 side down. If this piece is supposed to be rolled to the left 

 it will fall into its place on Fig. 2 1 , the points marked a in the 

 two figures coinciding. Both 

 these figures are of the size 

 of the objects. In Fig. 21 

 the whole of the surface cov- 

 ered with little rings, which 

 represent pits, except a nar- 

 row strip occupying a part 

 of the right-hand side, ap- 

 pears to be made up of one 

 or more dental plates. This 

 is flat along the middle of 

 the figure, but shelves off 

 quite steeply on the right. 

 Near the anterior end is a 

 fold which runs obliquely 

 outward and backward ; and 

 there is a similar fold near 

 the hinder end of the dental 



plate. These folds may be artificial, but they probably 

 represent sutures separating distinct bones. If so, the most 

 anterior one is probably the glossohyal (gl. h.); the others 



\_yanuary, igoj.'\ 3 



A nogtnius favirostris Cope. No. 

 Paratype. Floor of mouth, «, point 

 with a of Fig. 22 ; b. br., basi- 

 den., dentary ; gl. /;., glossohyal. 

 Same as Fig. 21. Roof of mouth, a, 



point coinciding with (I of Fig. 21 ; wx., maxilla ; 



pal., palatine ; par., parasphenoid. 



Fig. 21. 

 2 log. X 1 

 coinciding 

 branchials 



Fig. 22. 



