DINOCERATA. 



Trapezium and Trapezoid of Dinoceras mirabile, Marsh. (Left foot.) 



One-half Natural Size. Page. 



Fig. 1. — Trapezium; lateral view, showing outer surface, 110 



Fig. 2. — The i^ame; posterior view, -. . 110 



Fig. 3. — The same; lateral view, showing inner surface, articulating with trapezoitl, 110 



Fig. 4. — The same; anterior view, .. . - 110 



Fig. 5. — The same ; proximal view, showing articulation with scaphoid, 110 



Fig. 6. — The same; distal view, showing metacarpal articulation, 110 



Fig. v. — Trapezoid; front view, showing external surface, 111 



Fig. 8. — The same; lateral view, showing face adjoining trajjezium, ... 111 



Fig. 9. — The same ; jjosterior view, 111 



Fig. 10. — The same; lateral view, showing face adjoining magnum, . 111 



Fig. 1 1. — The same; proximal view, showing articulation with scaphoid, 111 



Fig. 12. — The same; distal view, showing metacarpal articulation, .. m 



