AVilliston.] Cretaceous Fishes. 255 



the six teeth of the middle row, of which only two have the 

 crowns preserved. Cope's type had only the middle and ex- 

 ternal rows, and none of the teeth had well-preserved crowns. 

 The middle teeth seem to correspond exactly in size with the 

 types. 



On the inner side the jaw projects as a rather broad trough, 

 with a thin edge, apparently broader posteriorly than anteriorly. 

 Its width here is nearly as great as the width of the inner row 

 of teeth. The inner teeth are large, their width equal to nearly 

 half their length. The surface of the crowns is smooth and 

 convex, more so antero-posteriorly than transversely. The 

 middle row has the teeth placed a little obliquely to the others, 

 and the surface is more flattened transversely in the middle. 

 The axes of the crowns of the two rows are placed at a distinct 

 angle with each other. 



Length of four teeth, inner row 36 mm. 



Transverse diameter of crowns, inner row 17 " 



Length of five teeth, middle row 31 " 



Transverse diameter of crowns, middle row 12 " 



Thickness of jaw, at middle row of teeth 22 " 



The specimen was collected from the Kiowa shales, near Bel- 

 videre, by Mr. C. N. Gould. 



Coelodus stantoni, n. sp. Plate XXIV, fig. 12; plate XXVI, fig. 6. 

 Ca J >>(/>'.« stem ton i Williston, cf. cit. 28. 



A fragment of the right lower jaw, containing two perfect 

 crowns of the internal row, together with the bases of four 

 teeth of the middle row, evidently represents a species distinct 

 from the previous one. The teeth are much smaller in size, 

 more elongated and distintly kidney-shaped, the ends narrowed. 

 The surface is smooth, strongly convex antero-posteriorly, and 

 gently so from side to side. The jaw is much less robust than 

 in the preceding species. 



Transverse diameter of tooth, internal row 14 mm. 



Antero-posterior diameter of same 5$ " 



Lfnsrth of four teeth, middle row 17 " 



Transverse diameter of tooth, middle row 11 " 



The middle teeth seem to be larger in proportion to those of 

 the internal series than in the preceding species. Kiowa shales. 



