Peterson : Nf.w Camei, from the Miocene of Nei-.raska. 263 



Pf transverse diameter at base 5 



Antero-posterior diameter of continuous niolar-premolar series 124 



P2 antero-posterior diameter 12 



P2 transverse diauieter 5 



P3 antero-posterior diameter 16 



Pj transverse diameter 6.5 



Pf antero-posterior diameter 19 



Pj transverse diameter 10 



M^ antero-posterior diameter 20 



My transverse diameter 13 



M.T antero-posterior diameter 24 



M J transverse diameter 17 



My antero-posterior diameter 39 



Mj transverse diameter 16 



Vertebral Column. 



(Pl.ATK XL.) 



Tlic \erl(.'bral coluiiin is represented by the greater portion of the 

 cervical region, which was found in a consecutive series from the 

 occipital condyle to the fifth cervical. Of these vertebrae the atlas, 

 the third, and fourth cervicals are complete; the axis is somewhat 

 damaged by erosion; wliile the fifth cervical is represented only by the 

 anterior portion. 



Atlas. — PI. XL, Fig. 6. The size of the atlas compared with that of 

 0. longipcs is more nearly normal than is the case in the vertebra; 

 succeeding it. Excepting a deeper notching on the lateral borders of 

 the articulation for the condyles in longirostris the detailed structure 

 of the bone in the two species does not difler. The bone is of con- 

 siderable length antero-posteriorly ; the alae being moderately expanded 

 transversely, but extending well back of the articular faces for the 

 axis, and terminating in rather hea\y i^rotuberances. The neural canal 

 is of large size and the neural spine is only very slightly indicated. 



Axis. — PI. XL, Fig. 5. The axis is actually, as well as proportion- 

 ally, shorter than that bone in 0. longipes. The articulation for the 

 atlas, however, is of considerably greater diameter, and the neural 

 spine is heavier, while the postz^gapophyses, in their uncrushed state, 

 are very slighth" broader than in the latter species. From the poste- 

 rior half of the axis the neck, throughout its length, does in fact show 

 the curious small proportionate diameter. The shorter neck in the 

 present species would seem to be, at least to some extent, offset by the 

 abnormal length of the head. 



