7 20 



THE AMERICAN NA TURALIST. [Vol. XXXVII. 



eighteen in C. cabanisi, with a variable arrangement of the 



1 6. Vertebrae comparatively large; long hypapophysial proc- 

 esses characterize the ultimate cervicals and the dorsals. 

 Centra of dorsal region laterally compressed, subopistho- 

 ccelous (Parker). Pneumatic. Neural canal large in mid- 

 division. Carotid-hypapophysial canal open. Seven caudal 

 vertebrae and a pygostyle. 



17. Pelvis broad and shallow; ilia widely separated from sacral 

 crista, with a peculiar process on the outer free margin of 

 either bone. Postpubic element long and slender, projects 

 posteriorly, and is not in contact with ischium above. One 

 pair of vertebral parapophyses throw n out as braces opposite 

 the acetabular. 



18. Sternum 4-notched behind, with carina projecting in front. 

 Manubrium either entirely aborted or much reduced. Pneu- 



19. Os furcula broadly U-shaped, slender below, broad above, 



