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. 



