OSTEOLOGY OF E. DOLLOVIANUS, COPE 



17 



present but is shorter. The transverse process is rising from an}- 

 contact with the centrum to a position on the base of the neural 

 arch. The intercentrum is in position and is similar to the earlier 

 ones. The keel on the lower edge is very thin and sharp and of 

 considerable vertical extent. The posterior face of the centrum 

 is no lower than the anterior. The base of the spine is still very 

 thin, so that the spines probably were not greatly elevated. 



MEASUREMENTS OF THE FIFTH CERVICAL. 



Length along the bottom line of the centrum 

 Width of the posterior zygapophyses 

 Width anterior zygapophyses 



The sixth cervical 

 differs from the 

 others in the rela- 

 tive shortness and 

 the greater height 

 of the centrum. The 

 transverse process 

 rises from the upper 

 portion of the neural 

 arch and is well 

 above the neural 

 canal and the cen- 

 trum ; the ridges on 

 the centrum which 

 supported the transverse process have lost connection with it 

 and are present as rudiments which are evidently disappearing. 

 The transverse process curves downward close to the centrum 

 and trends very slightly to the rear; the lower end does not 

 extend below the lower edge of the centrum. This is the first 

 of the vertebrae posterior to the axis in which the intercentrum 

 is not attached, but from the size of the articular space on 

 the lower edge of the anterior face of the centrum it is evi- 

 dent that it was as large as the others and that its displacement 

 is accidental. The articular faces of the zygapophyses are hori- 

 zontal, and the keel on the lower portion of the centrum is \-erv 

 thin and prominent. 



Fig. 13. — Fifth cervical, a, from above; l>, from the 

 side. % natural size. 



