Stewart.] Cretaceous Fishes, 350 



extending upward on the external side. The superior border 

 is badly preserved. 



Greatest depth 101 mm. 



Transverse diameter of condyle 24 " 



There are several other tooth-bearing elements, the exact 

 location of which cannot be determined. Two of these are 

 long, slender bars of bone covered with denticles on one side, 

 somewhat resembling shagreen. Another is more fiat than the 

 above and covered with somewhat larger denticles. Still an- 

 other is very thin and covered with various-sized denticles on 

 one side. 



The basioccipital is separated from all of the surrounding 

 bones. The condyle is deeply concave and broader above than 

 below. Just in front of the condyle there are two lateral facets 

 for the attachment of the exoccipitals, which are much rough- 

 ened and look outw r ard and forward. In front of these facets 

 the bone is narrow and has a median ridge, which is continued 

 downward on the anterior end. On the low^er portion the bone 

 has a deep carina, which extends forward to near the extremity 

 and forms a sharp projection posteriorly. There is a slight 

 groove in the median line that Professor Cope 113 thought repre- 

 sented the muscular tube. 



Transverse diameter of condyle above 39 mm. 



Vertical depth of condyle 35 " 



Length of superior border 57 " 



There are several other bones present w r hose location cannot 

 be determined, although they are probably located in the pos- 

 terior part of the skull. Figures of these are shown on plate 

 LXX. There are a number of ver.tebne with the specimen, 

 which are larger than in the largest specimens of Ichthyodcctcs 

 that I have examined. The sides are devoid of lateral grooves, 

 but are covered with numerous small ridges which inosculate 

 with each other, giving the outer surface of the vertebra a some- 

 what lace-like appearance. In this respect the vertebrae have 

 a superficial resemblance to those of Anogmius, but when they 

 are examined closely it is found that the ridges are more irregu- 



113. Cret.Vert., p. 221 a. 



