186 

 The measurements of the specimen are as follows: 



Liues. 



Lcngtli of ceuti'um iiifeiioily 5. C 



Height of ceutrum auteriorly 15. 5 



Width of centrum iu line with the parapophyses 20. 



Another specimen from the same locality as the preceding is represented 

 in Figs. 3, 4, Plate XXXII. It appears to be the centrum of an atlas, and 

 may probably belong to the same species as the former, though, judging from 

 its difterent aspect, to a ditfereut individual. 



The centrum is transversely oval and slightly curved, with the convexity 

 of the curve directed forward Its breadth is two and a half times the height, 

 and over live times the length. 



The anterior sui-face is nearly flat and somewhat uneven, and just above 

 the center is depressed into a concave pit about one-fifth the diameter of the 

 centrum. The posterior surface presents the usual cone with its l)ot- 

 tom just above the center. 



The sides of the centrum are concave between the articular borders, and 

 bear no trace of parapophyses. The lower part is more flat, and presents a 

 shallow fossa on each side of a median concavity. The fossae for the neural 

 arch are quite prominent at their contiguous borders. 



The measurements of the specimen are as follows : 



Lines. 



Length of centrum inferiorly 4 



Height of centrum anteriorly 14 



Breadth of ceutrum at middle 22 



A third specimen, from the same locality, less well preserved, resembles 

 the first one, and belonged apparently to a somewhat smaller individual. Its 

 parapophyses barely project beyond the sides, and are hollowed at the end. 

 The ridges defining the inferior surface from the concave sides are barely 

 excavated. 



Its measurements are as follows : 



Lines. 



Length of centrum inferiorly 5. 5 



Height of centrum auteriorly 15. 5 



Breadth of ceutrum at the upper third 18. 25 



A series of three specimens, witii a portion of another, from the same 

 locality as the preceding, appear to correspond with the anterior vertebrae of 

 Araia from the second to the fifth inclusive. The fragment resembles the 

 lateral half of the atlas above described, but is bi-concave. The other speci- 

 mens resemble the first and third ones above descril)e(l in the form of the 



