DINOCERATA. 

 Radius of Dixoceras mirabile, Marsh. 



One-fourth Natural Size. p 



Fiii. 1. — Left Radius ; anterior view, qo 



]« — Di.stal end. 



Fig. 2. — The same; inner view, qo 



Fig. :).— The same; posterior view, showing surface aj^plied to uhia, 93 



3a — Proximal end. 



Fig. 4. — The same; exterior view,. 



93 



