Stewart. I Cretaceous Fishes, 321 



process forward internally, but does not encroach much upon 

 the dentary externally. Posteriorly it sends a lamina of bone 

 backward, which I think would be well named the cotyloid 

 process, as in most of the genera of this family it is the only 

 portion of this bone which articulates directly with the quad- 

 rate, .lust beneath the cotyloid process there is a prominent 

 angle. 



The antarticular is a small element not extending forward be- 

 yond the sixth posterior tooth, and is fitted into a groove in the 

 dermarticular. It supports nearly the wmole of the cotylus, 

 which is somewhat elliptical and concave from above downward. 

 The predentary is not so elongated, but is slightly deeper than 

 in the species described above. 



Mandible : LeDgth of alveolar border 149 mm. 



Length from cotyloid cavity 174 " 



Depth at symphysis 27 " 



Depth at coronoid 46 " 



Number of teeth in one centimeter, 3. 



Predentary : Length 55 mm. 



Length of symphyseal surface 24 " 



The quadrate is a broad, fan-shaped expansion. The condyle 

 is elliptical in outline and convex. Extending upward from 

 the condyle on the external side there is a ridge, which ends 

 above in a deep notch, which accommodates a portion of the 

 symplectic. This groove continues downward on the internal 

 side for more than one-half the depth of the bone. The poste- 

 rior border has a very slight groove, and extends upward the 

 whole extent of the symplectic. The superior border probably 

 articulates with the pterygoid and metapterygoid, as in Xiphac- 

 tinus. The anterior border is sharp. Both the external and in- 

 ternal surfaces are covered with minute stria* radiating upward 

 from the condyle. The symplectic is a long, slender element. 

 The upper end presents an articular surface similar to that 

 found on the superior border of the quadrate. 



The whole of the palatine is preserved. It is an irregular- 

 shaped bone, presenting a ragged sutural surface above and be- 

 low for the pterygoid and mesopterygoid. The bone is especially 

 remarkable for the great depth of the malleolar portion, being 



