Stewart.] Cretaceous Fishes. 345 



face, which bears denticles slightly larger than those on the 

 parts described above. On the opposite surface from the tooth 

 band there is a ridge extending its full length, which is over- 

 hanging on one side, thus forming a groove, which is probably 

 for the reception of some other bone. 



Length of tooth band 69 mm. 



Greatest width of tooth band 17 " 



There are two other bones which are covered with small pits, 

 and somewhat resemble those found on the tooth-bearing ele- 

 ments described above, although it is likely that these bones 

 never bore teeth. One of these is a cordfform bone, and is 

 probably a pharyngeal. The pitted surface is slightly de- 

 pressed in the middle, and the sides slope sharply toward the 

 edges. The other element is not so thick as the one just men- 

 tioned ; it has a broad band of these pits on one side and a 

 median ridge on the other, somewhat similar to that found in 

 the supposed pterygoid described above. At one of the ends 

 there is a roughened articular surface. There is another long 

 and slender element that bears a superficial resemblance to the 

 palatine bone of Stratodus apicalis, which is no doubt the same 

 bone described as a palatine by Professor Cope. 103 It is broader 

 at one end than at the other. The lower (?) surface is covered 

 with small pits similar to those described above, but there are 

 no teeth present in any of the specimens that I have examined. 

 The upper surface is somewhat striated at the anterior (?) ex- 

 tremity. 



The ceratohyal is a broad and thin bone, concave at the pos- 

 terior end and somewhat irregular in outline at the anterior, 

 where there are two surfaces, for the hyo- and urohyals, re- 

 spectively. The bone seems to be striated, especially so toward 

 the extremities. Its length is 98 mm. 



The quadrate is fan-shaped and very thin anteriorly. The 

 condyle is very convex and has a superficial resemblance to the 

 distal end of the mammalian femur. Extending upward from 

 this, along the posterior border externally, there is a prominent 



103. Proc. Am. Phil. Soc. 187*, p. 179. 



23— vi 



