Plate XXIV. 



Figure 1. — Adjacent ends of metacarpal V and the first phalanx of the left wing of 

 Pteranodon sp., No. 2628 ; ulnar side, x 0.50 



Figure 2. — The same specimen ; radial side, x 0.50 



Figure 3. — Adjacent ends of metacarpal V and the first phalanx of the left wing of 

 P. occidentalis Marsh, No. 1165 (identification of O. C. M.), at the angle of ex- 

 treme flexure ; ulnar side, x 0.50 



Figure 4. — The same specimen ; radial side, x 0.50 



Figure 5. — Conjoined fragments of the left metacarpal V and the first phalanx of Pteran- 

 odon sp., No. 2660; palmar surface, x 0.67 



Figure 6. — The same fragments separated ; palmar surface, x 0.67 



