145 



frontal, suspe.usorial, pterygoid, articular, and qiiadialc Ikhics; hy parls or 

 wholes of" several vertebni;, which are all dorsals; and Ijy soapida and cora- 

 coid, with many elements of the fore linil). The latter include luimenis, 

 radius, a carpal, and numerous metacarpals and plialansrcs. 



The species is tirst well characterized by the form oC tin; 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 

 vaiidus, Cope, and Mosamurus depressu,s, Cope. Its internal any;le of the 

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

 but is less ])r()niinent than in it. It extends to near the distal end, disappear- 

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

 dinal angles. Tiie former of these is short, and it disappears l)y 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 pro[)ortionateIy 

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

 able from the present surface; but it is |)ossible that tin; greater part is filled 

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

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

 No meatal knob. 



The sus{)ensorium is slender. It is peculiar in the great extent of the 

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

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

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

 superior face. 



The pahitine has been free from its fellow medially, A distal and 

 median portions have hecn lost ; the remaining fragments presents i)a.ses and 

 alveolse for eleven teeth. Tiie fangs are rugulose and I)ut little swollen ; 

 probably five to .seven .«tood on the lost portions. The i)ases 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 adiicreiit parts of the angular. The latter forms a narrow band on the 



lower edge of tlie 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 



