Stewart.] Cretaceous Fishes. 335 



near the superior border as in the Ichthyodectida . and has a 

 strong rid^e extending backward from it on the internal side. 



The hyoraandibular presents two articulating surfaces above 

 for union with the skull. These are slightly grooved longi- 

 tudinally and are separated from each other by a deep notch. 

 The anterior of these is projected well forward. The condyle 

 for the operculum is situated probably more than one-half the 

 distance down the side of the bone, and is elliptical in outline 

 and very irregular. Just in front of the condyle there is a 

 prominent ridge which extends downward, but not to the lower 

 extremity of the bone. The inferior portion is rather narrow ; 

 the anterior very thin. 



The cerato- and epihyals are preserved in one specimen, while 

 the urohyal is shown in another. The epihyal is very thin and 

 has the anterior extremity slightly convex for the ceratohyal. 

 Near the postero- superior end there is a deep notch, probably 

 for the accommodation of the interhyal. Both the external and 

 internal sides are covered with fine striae. The ceratohyal is 

 an elongate, slender bone, expanded at the extremities and con- 

 tracted slightly at the center. Both sides are covered with 

 stria', which are especially noticeable toward the extremities, 

 which are nearly flat. The urohyal is a small, triangular ele- 

 ment, badly crushed, with a small facet on the anterior end for 

 its fellow on the opposite side. 



There is a long, thin plate of bone that I am inclined to 

 think represents the palatine. It is contracted to a blunt point 

 at both extremities, and covered with fine stria' on one side 

 which radiate from a point near the superior border and about 

 one-third the distance back from the anterior end. The central 

 portion of the lower border is covered with a single row of 

 small conical teeth, each of which seems to be firmly anchy- 

 losed to the bone, with the apex directed forward. The ex- 

 tremities of this border are edentulous. 



The ethmoid is a symmetrical tongue-shaped bone covered 

 with teeth below. Professor Cope '-says this bone is sometimes 

 symmetrical and sometimes unsymmetrical, and lie was in- 



r-t.Vf-rt.W 



