PEOZEUGLODON. 



2-5£ 



greatly elongated from above downwards, their upper ends running out on projecting 

 plates of bone, the summits of which are nearly on a level with the upper border of the 

 neural arch, with the anterior edge of which they are united by narrow bars of bone, 



Text-fig. 83. 



n.sp. 



n.sp. 



hyp. 



T/C. 



Anterior cervical vertebrBe of Prozeuglodon atrox : A, atlas from front ; B, axis from front ; 

 C, third cervical from front ; D, the three anterior cervicals articulated with one another, from left side. 



at, lateral surface for atlas ; a.z., anterior zygapophyses ; cond., condylar cups of atlas ; ep., epiphysis of 

 centrum ; %p., hypapophysis ; n.sp., neural spine ; od., odontoid process ; p.z., posterior zygapophyses ; 

 sp.n., passage for first spinal nerve ; t.j>., transverse process ; v.c, vertebrarterial canal. ^ nat. size. 



enclosing a pair of large foramina for the first spinal nerve {sp.n.). The articular surfaces 

 are strongly concave from above downwards and slightly so from side to side. They 



