30 KANSAS UNIVERSITY QUARTERLY. 



same length as a very complete specimen of C. tortor in the museum, 

 the proportions of the animal were very much stouter. The figures 

 given in plate VI of the twenty-fifth, or eighteenth dorsal, vertebra will 

 show the relations between length and breadth : it is upon these re- 

 markably stout proportions, and the shape of the articular faces, as 

 indicated by the figures and by the measurements appended, that the 

 species is chiefly based. The articular surfaces of the basal caudal 

 vertebrae are remarkably triangular in shape, with the angles rounded, 

 and the sides of nearly equal length. This triangular shape is persis- 

 tent for the first twenty of the series as they are preserved. The 

 paddles, as shown in plates IV and V, show much stouter proportions 

 than in either C. velox or C. tortor. 



The species comes nearest to C. stcnops Cope, but it seems hardly 

 the same. It is, also, evidently allied to C. dispar Marsh. From 

 these and other described species, the following, extracted from the 

 original descriptions, will serve to show the differences, in comparison 

 with the specimen of C. Westii. 



C. dispar. 



The articular faces in the cervicals are a broad transverse oval, 

 faintly emarginated above for the neural canal. In the dorsals and 

 lumbars the cup continues transverse, and the emargination is deeper, 

 but in the anterior caudals the outline becomes a vertical oval. There 

 appears to have been thirteen mandibular teeth. 



Length of axis with odontoid process 32 lines. . . . 100 



Width between diapophyses 26.8 .... 103 



Length from edge of cup to end of ball in 



eleventh vertebra 25 .... 100 



Width of ball 14 56 



Depth of ball 12 .... 43 



O. "Wymani. 



In the cervical vertebrae, the outline of the articular faces is trans- 

 versely cordate. The centra of the anterior dorsals are elongate, and 

 much constricted behind the diapophyses. In the anterior caudals, 

 the articular faces are a broad vertical oval. 



Length of axis with odontoid process 19 lines .... 100 



Width between diapophyses 17 .... 89.4 



Width of ball 8 42. i 



Depth of ball 7 .... 36. 7 



Length of sixth cervical, without ball 13 .... 100 



Width of cup 9 .... 69. 1 



C rex. 



The cervical vertebrae have very broad, transversely oval faces, 



