Plate XXV. 



Figures 1-7. Wing bones preserved in Pteranodon sp., No. 2452. x 0.35 



Figure 1. Right ulna; palmar view. 



Figure 2. Right radius ; palmar view. 



Figure 3. Left metacarpal V. 



Figure 4. First phalanx of the left digit V (wing finger) : radial side. 



Figure 5. Second phalanx of the left digit V ; radial side. 



Figure 6. Third phalanx of the left digit V ; radial side. 



Figure 7. Fourth or terminal phalanx of the left digit V ; radial side. 



