20 KANSAS UNIVERSITY QUARTERLY. 



Height of spine above floor of neural canal 42 millim. 



Depth of hypapophysis below floor of neural canal. . . . 30 



Width of spinous process 26 



7. Length of seventh cervical vertebra 37 



Height of spine above floor of neural canal 46 



Transverse diameter of ball 19 



Vertical diameter of ball 20 



Width of spinous process 27 



Dorsal vertebrae. 



There are thirty-five vertebrae between the cervicals and the first 

 non-rib-bearing vertebra, to which the pelvis was, evidently, attached. 

 The distinction between the cervicals and thoracics cannot be made 

 from any characters they possess, as the seventh vertebra does not 

 bear a distinct hypapophysis. Neither can it be said with certainty 

 from this specimen which is the first thoracic vertebra, as the cervical 

 ribs had, unfortunately, been displaced in the collection and prepara- 

 tion of the specimen. In another specimen, referred to C. pumilus, 

 and which, as will be seen later, cannot be specifically distinguished 

 from the present species, short cervical ribs were found attached to six 

 vertebrae posterior to the atlas. That the eighth vertebra is a thoracic 

 one is shown by the relation of the ribs in this specimen. Posteriorly 

 there is no distinction, also, between the true thoracic vertebrae and 

 those of the lumbar region. All the vertebrae anterior to the pelvis 

 bear ribs, and will all be considered as dorsal vertebrae, the true 

 thoracic vertebrae being restricted to those of which the ribs are 

 elongated, and, probably, connected with the sternum. 



In the anterior vertebrae of the series, the centra are subcarinate 

 below, the obtuse, rounded ridge becoming less and less apparent until 

 no indications of the keel can be seen, before the middle of the series. 

 The transverse processes are stoutest, with a more elongated, sigmoid 

 articular surface, with little or no constriction, and projecting only 

 slightly beyond the stout articulating processes, in the anterior verte- 

 brae. In the tenth or eleventh, the articular surface has become 

 markedly smaller, more vertical, and less sigmoid in outline. Thence 

 to the last, the articular surface for the ribs remains nearly the same. 

 The process itself, however, becomes gradually more prominent and 

 constricted, as the zygapophyses becomes smaller. The spinous pro- 

 cesses increase slightly in length and breadth, and are only slightly 

 oblique throughout. In length, the centra increase gradually. The 

 vertical diameter of the ball increases gradually, while the transverse 

 diameter remains more nearly the same. 



