30 MEMOIRS OF THE CARNEGIE MUSEUM 
The Cervicals. Plate II., Series 3 and 4. 
The Third (2?) Cervical (Plate II., Fig. 3, Series 4).— The most anterior vertebra 
of the cervical series pertaining to this skeleton I have referred to the third although 
it may pertain to the axis. Its fragmentary condition precludes the possibility of 
determining the exact position with certainty. Its position in the quarry is shown 
at 1 in the first diagram. It consists of the posterior portion of the neural arch with 
the posterior zygapophyses and it could hardly have occupied a position posterior to 
the third cervical although it may pertain to the axis. 
The Fourth Cervical (Plate II., Fig. 4, Series 4). — A little to the right of the cer- 
vical fragment just described the present vertebra, which I interpret as the fourth 
cervical, was found. Its exact position in the quarry is shown at 2 on the diagram. 
It is essentially complete and but little distorted, though as with all the cervicals of 
this series the rib is disarticulated as was to be expected considering the age of the 
individual. The posterior zygapophyses and transverse processes are widely ex- 
panded. Near the anterior extremity and on either side of the centrum a strong 
process springs from the inferior lateral border. At the extremity this expands into 
a capitular facet for the articulation of the capitulum of the cervical rib. ‘These 
processes as well as the similar, though less pronounced ones found on the succeed- 
ing cervicals may possibly be homologous with the parapophyses. In the present 
vertebra they are produced far below the inferior border of the centrum. The 
pleurocentral cavity is deep and invades the base of the ball. It-is confluent with 
a rather deep cavity found on the superior surface of the process which supports the 
capitular rib facet. It is imperfectly divided into anterior and posterior cavities by 
a low rounded ridge which may be regarded as an incipient oblique lamina. The 
centrum is markedly opisthoccelous with the cavity of the posterior extremity sub- 
circular in outline. The inferior surface of the centrum is broad and there are five 
shallow infracentral cavities. One of these, the posterior, is medial, and the an- 
terior four are lateral, arranged two on either side of the central line, one at the 
base of and two posterior to the processes which support the rib facets. The cen- 
trum is much contracted medially. 
The Eighth Cervical (Plate II., Fig. 8, Series 4). — Between the vertebra just de- 
scribed and the next in our series it is evident that a number are missing. I have 
estimated the number of missing vertebree at three. ‘This would make the position 
of this vertebra the eighth in the series, a position with which it agrees very well 
if we commence with the last of the series and work forward, so that I have but 
little doubt that this was its correct position. It is essentially complete and not 
badly crushed or distorted. Save for its greater size in its general form it very 
