176 



KANSAS ACADEMY OF SCIENCE. 



there is but one large tooth, situated just in front of the orbit. The largest teeth 

 of the lower jaw are the ones corresponding to those of the premaxillary; the 

 posterior teeth, however, are much larger than the corresponding ones in the upper 

 jaw. The anterior teeth, especially, are elongate, conical and lightly recurved. All 

 are sharply pointed, with the crown, to within a half or three-fourths inch of the 

 socket, finely striated. The largest is that of the premaxillary. just in front of the 

 maxillary suture, measuring 53 mm. in length by 13 n\m. in width at the base. The 

 first tooth in the lower jaw is fully as long, but a little more slender. 



The entire length of the skull is about nineteen inches; its greatest height, about 

 nine inches. The width at the extremity of the quadrates, as indicated by the plane 

 of the mandibular symphysis, could not have been great. It is very evident that 



the skull was a long and narrow one, quite 



similar to that of Plesiosanrus Conybeari Sol- 



y^ J^ las. and very different from the depressed 



f ones, with flat parietals. indicated by other 



remains. 



The extremity of a small bone was found 



a -9*4''*/^^^™' MI^^M^^ l.yifig upon the inner side of the lower mandi- 



^* -•- ' "^^^i- J^^^^^^ I'lf : it is evidently a part of a hyoid bone. 



mw.^% ■■'"' 



•»'?T^'^ CEKVICAL VEBTKBB/E. 



Twenty-eight vertebrse. in a continuous 



,ts ■ f JS series, were obtained by Mr. West, the 



■^'Jhy^n^^^k^ Wt ^^^* ^'^® ^^ ^^^' owing to exposure, in less 



«»,v <• T&ms ])erfect condition; the others with their 



various processes complete, or nearly so. 



Traces of the sutures uniting the neural 



I ^IkV^i"^" - "^ arches with the centra can be distinguished 



in the third and fourth vertebrse. but in all 

 the others they are entirely obliterated. The 

 bVVW ^'^4*'"'v ^ ^ atlas and axis have not been separated from 



■^J^V^X^ the skull, and the characters of the former 



•■' -^ cannot be made out. There are no zygos- 



Thinl cervicjii vertebra. ('. Snnwii Wii- xhenes. The third vertebra, as figured, differs 

 list- xl from the following ones in the greater obli- 



quity and slightly greater length of the spine, in the more oblique anterior face of 

 the centrum, in the presence of a conspicuous carina below in front, and in the sim- 

 ple, pointed shape of the pleurapophyses. The measurements of this vertebra are 

 as follows: 



THinn C'EHVirAL vkrtehra. 



Length (if centrum, below '^'^ milliin. 



Length of ceiitriim, above -" 



Height of centnim '-■• 



Wklth of centrum -'- 



Heiffht of spine above floor of neural canal •'••' 



The fourth vertebra has the neural spine less oblicjue and broader, the carina, 

 in the middle of the concavity of the under surface, not visil)le from the sidt". .uul 

 the pleurapopliysis broad, and of equal width. 



FOURTH CERVICAL VERTEDRA. 



Length of centrum 80 milliin. 



Heif<ht of centrum '-" 



lleifjht of spine above floor of neutral canal ■**' 



Width of .Kpine -•* 



I^enf,'lh of iilcurapophysos ■*-'^ 



WiiHli of pleurapophyses -* 



