Plate XIX. 



Figures 1—8. — Bones of the left wing preserved in the type of P. ingens Marsh, No. 1175. 

 x0.30 



Figure 1. — Humerus ; superior or anconal surface. 



Figure 2. — The same bone ; inferior surface. 



Figure 3. — Ulna ; inferior surface. 



Figures 4a, 4b. — Proximal and distal ends of the radius ; inferior surface. 



Figures 5 a, 5b. — Proximal and distal ends of metacarpal V. 



Figure 6. — Carpus ; proximal surface. 



Figure 7. — Carpus ; dorsal view. 



Figure 8. — Carpus ; distal view. 



Figures 9— 19.— Bones of the right wing preserved in the type of P. occidentalis Marsh, 

 No. 1164. x 0.30 



Figure 9. — Humerus ; superior or anconal surface. 



Figure 10. — The same bone ; inferior surface. 



Figure 11. — Ulna; proximal end: superior surface. 



Figures 12a, 12b. — Proximal and distal ends of the radius; superior surface. 



Figure 13. — Carpalia : proximal surface. 



Figure 14. — Carpalia ; distal surface. 



Figures 15 a, 15 b. — Fragmentary metacarpal V. 



Figure 16. — First phalanx of digit V (wing finger) ; radial side. 



Figures 17a, 17b. — Proximal and distal ends of the second phalanx of digit V; 



radial side. 

 Figures 18a, 18b. — Proximal and distal ends of the third phalanx of digit V: 



radial side. 

 Figure 19. — Fourth phalanx of digit V ; radial side. 



