149 



The size of this reptile was near that of Liodon validus, perhaps thirty- 

 five to forty feet in length. 



The specimens on which this species rests were discovered hy Prof. B. 

 F. Mudge, formerly State geologist of Kansas, now professor of geology in 

 the State Agricultural College of Kansas, on the north bank of the Smoky 

 Hill Eiver, thirty miles east of Fort Wallace, Kansas. 



Numerous fragments of another larger individual were found by Professor 

 Mudge near the same locality, which belong probably to the same species. 

 Among them is a portion of the maxillary bone, with bases of two teeth ; the 

 bases of the crowns where broken off are not compressed, but slightly oval. 

 A radius is a flat bone, more dilated at one extremity than that of Clidastes 

 p/opython. 



Measurements. 



M. 



Length of the radius 0. 108 



Width of the radius at the narrow extremity 0. 064 



Width of the radius at the wider extremity 0. 080 



Width of the radius medially 0.043 



Iii addition to the two individuals procured by Prof. B. F. Mudge, the 

 writer obtained a considerable part of a third from a low bluff on Fox Canon, 

 south of Fort Wallace. This includes seventeen lumbar, dorsal, and cervical 

 vertebrae, including axis, with ribs, and a large part of the cranium, with both 

 quadrates, occipital and periotic regions, etc. Its characters may be briefly 

 pointed out as follows : 



Articular surfaces of dorsal and cervical vertebrae transverse oval, exca- 

 vated above for neural canal ; diapophyses not extending below to the edge 

 of the cup, hence not receiving an area of articular cartilage continuous with 

 the rim. Occipital crest low, oblique ; quadrate bone larger ; the meatus 

 depressed between ridges. A button of articular surface on posterior face 

 of hook. Scarcely any rudiment of zygosphen. Teeth small, much incurved, 

 faceted, and striate-ridged. 



Some characters, additional to those already derived from the first-known 

 examples, may be added. The mandible supports only twelve teeth. The 

 palatine bone is shorter anterior to the external process, and longer behind it 

 than in H. coryphaeus. In our specimen, the posterior extremity is broken 

 off, yet shows no indication of the emargination for the pterygoid bone an inch 

 behind the position of its anterior extremity in H. coryphaeus. There are ten 

 teeth on the part preserved, four in front of transverse process (six in H. 

 Coryphaeus), and six (probably seven) behind (six in H. coryphmis). 



