84: ODONTORXITHES. 



margin of the preceding vertebra. The transverse processes are elongate, 

 and gradually expand after leaving the vertebra. Their posterior margins 

 are at right angles to the axis of the centrum, and slightly in advance of 

 its posterior articular face. The lower margin of this face was covered by 

 the hypapophysis coossified with the centrum of the following vertebra, 

 and, when in position, the anterior part of this process nearly reached the 

 hypapophysis in front. The neural arch covers the greater part of the 

 centrum, and the neural spine is short, and compressed. 



Measurements of Eighth Caudal Vertebra. (So. 1200.) 



Length of centrum, 15.2 mm 



Transverse diameter of anterior articulation, 8.0 



Vertical diameter of anterior articulation, 7.0 



Vertical diameter of anterior articulation, with hypapophysis, 11.0 



Transverse diameter of posterior articulation, 8.5 



Vertical diameter of posterior articulation, 6.0 



Length of floor of neural canal, 14.5 



Transverse diameter of neural canal, at anterior opening, 2.0 



Vertical diameter of neural canal, at anterior opening, 3.0 



Diameter of vertebra, across transverse processes, 57.0 



Antero-posterior diameter of transverse process, at base, 8.0 



Transverse diameter of hypapophysis, 8.5 



Vertical diameter of hypapophysis, 4.0 



The Ninth Caudal Vertebra. (Plate XII, figure 9.) 



The ninth caitdal vertebra has a low depressed centrum, and enormous 

 transverse processes. The articular faces are nearly plane. The anterior is 

 crescent-shaped, with the angles rounded, and the convexity, which is 

 above, is notched for the neiu-al canal. The ventral surface has a large 

 hypapophysis, coossified with its anterior half, and projecting beneath the 

 preceding vertebra. The transverse processes pass off from the centrum 

 nearly at right angles with the axis (figure 23, page 86), and they are 

 much expanded horizontally. Their distal ends are truncated somewhat 

 obliquely, and the outer posterior angles are on a line with the posterior 

 articular face of the centrum. The neural spine is low, and of considerable 

 antero-posterior extent. 



