145 



frontal, suspensoi'ial, pterygoid, articular, and quadrate bones; by parts or 

 wholes of several vertebrae, which are all dorsals; and by scapula and cora- 

 coid, with many elements of the fore limb. The latter include humerus, 

 radius, a carpal, and numerous metacarpals and phalanges. 



The species is first well characterized by the form of the quadrate bone. 

 The specimen lacks a portion of the ala, and the postero-superior decnrved pro- 

 cess, but is otherwise perfect. Its form is intermediate between that in Liodon 

 vatidus. Cope, and Mosasaurus depressus, Cope. lis internal angle of the 

 proximal extremity is posterior to its usual position, as in the former species, 

 but is less prominent than in it. It extends to near the distal end, disappear- 

 ing between the extremities of the median posterior and the distal longitu- 

 dinal angles. The former of these is short, and it disappears by a gradual 

 descent distally in a very rugose margin. The distal longitudinal is short 

 and acute, not prominent at the distal extremity. From the posterior posi- 

 tion of the proximal internal angle, the alar articular surface is somewhat 

 elongate. The postero-internal face above the meatus is proportionately 

 short. The meatal pit is scarcely one-fifth the usual size, so far as determin- 

 able from the. present surface ; but it is possible that the greater part is filled 

 by an impacted mass of bone derived from the adjacent ridge. The margins 

 of the articular extremities and of the ala are striate and papillose rugose. 

 No meatal knob. 



The suspensorium is slender. It is peculiar in the great extent of the 

 exoccipital element, which covers the whole superior surface, and extends 

 externally over the opisthotic to the squamosal, concealing the former, except 

 its anterior margin. The proolic sends a small proximal portion only to the 

 superior face. 



The palatine has been free from its fellow medially. A distal and 

 median portions have been lost ; the remaining fragments presents bases and 

 alveolae for eleven teeth. The fangs are rugulose and but little swollen ; 

 probably five to seven stood on the lost portions. The bases of the crowns 

 are circular. The external process of the bone is slender and flat. 



The portion of the mandible preserved includes much of the articular, 



and adherent parts of the angular. The latter forms a narrow band on the 



lower edge of the external face, and one twice as wide on the inner face. 



The only characteristic feature is the lowness of the ridge which descends 



19 c 



