THE CERVICAL VERTEBRAE. 



77 



The Sixth Vertebra. (Woodcuts 91-IU, below.) 



The sixth cervical verte])ra of Dinoceras mirahih (number 1255) has 

 the articular faces of the centrum more transverse tlian in the preceding 

 vertebra. The neural canal is sub-cordate in outline, and tlie transverse 

 processes, to protect tlie lateral foramen, are more strongly developed 

 than in the vertebra last described. 



Figure 91. — Sixth cervical vfitc:)ia vi'JJinocenis mirabile, Marsh (No. 1255); back view. 

 Figure 92. — The same vertebra ; side view. 



nc. neuraLcanal; z. anterior zygapophvsis ; z'. posterior zygapophysis. 

 Both figures are one-foiutli natural size. 



Figure 93 — Sixth cervical vcriebra of Linoceras cunemii, Marsh (Xo. 1012); frout v 

 Figure !U —The same vertebra; side view. 



nc neural canal; z. aaterior zygapophysis; z'. po.=terinr zygapophysis. 

 Both figures are one-fourth natural size. 



In the sixth vertebra of Dinoceras cimeani, there is a distinct neural 

 spine, and the centrum is slightly quadrate in outline, as sIkiwu in tig-iiro 

 !)3. I1i(j Litter is s^horter tlian in the corresponding- vertebra of 7>/'//otcr«.s 

 ■iiur((bi!r, as seen hv a comparison of figures 92 and 94. 



i\Ieasurements of the sixth cervical vertebra in two individuals ot 

 DiiwccrdN are as follows: 



