215 



lary and dciitary bones, one loranicn 1«) each tootli. The alveolae are confluent 



as they approach this margin. 



There arc three vertebrae, which present two pairs of deep longitudina 



grooves, viz, two on each side, two on the interior, and two on the superior 



face of the bone ; the last receives the basal articulation of the ha3niapophyscs. 



The centra arc crushed. Their nieasureinents, witJi thos(^ of the jaws, are as 



follows : 



ifcavurcments. 



M. 



Length of the cciitruui 0.025 



LoDg (liatnctcr (crusbcd) 0. 035 



Short diameter (crushed) 0.0175 



Depth of the maxillary bono .'vntoriorly 0.031 



Depth of fho dentary bone anteriorly i 0.015 



Length of thu crown of the inferior tooth 0. OOG 



Length of the crown of the superior tooth 0. 004G 



Number of inferior tooth in O^.OI, :! ; number of aupcrior teeth in O'^.Ol, 4.5. 



The vertebrae arc about as largo as those of a fully-grown "drum-fish," 

 Pogonias. 



From the yellow chalk of the Upper Cretaceous of Kansas, found on the 

 Solomon or Nepaholla River, Kansas, at a point one hundred and sixty miles 

 above its mouth, and in Trego and Rooks Counties, by Prof. ]J. F. Mudge, 

 jn'ofessor of natural science in the State Agricultural College of Kansas. 



SAUROCEPHALUS, Harlan. 



Leidy has pointed out the mode of implantation of the teeth in the 

 typical species of this genus. The mode of succession of the teeth has not 

 yet been indicated, but is well displayed in a specimen of the jaw of 6". ara- 

 pahovms. Cope. It is known from Harlan's description that a large Ibramen 

 issues on the inner wall of the jaw, opposite each root. The fractured ends 

 of the specimen exhibit the course of the canal which issues at this foramen. 

 It turns abruptly downward between the inner wall of the jaw and the fang 

 of the functional tooth, and not far from the foramen. Its course is inter- 

 rupted by the crown of the successional tooth. This is situated obliquely as 

 regards the long axis of the jaw. 



It is thus plain that the successional ap|)earance of teeth is different in this 

 genus from what I have described in Portlieus and Iclithyodecles. In them, 

 the foramen is wanting, and the young crown rises within the pulp-cavity of 

 the functional teetli, as in the Crocodili/i. In this genus, on the other liand. 



