Plate XLIV. 



Fig. i. Right first wing phalange of Nyctosaurus gracilis. One-half nat- 

 ural size. 



Fig. 2. Right wing metacarpal of Nyctosaurus gracilis, from below. One- 

 half natural size. 



Fig. 3. Tibia of Nyctosaurus gracilis, from the side. Natural size. 



Fig. 4. Left femur of Pteranodon occidentalism.) Marsh, from behind. One- 

 half natural size. 



Fig. 5. Right second wing phalange of Nyctosaurus gracilis, from behind. 

 One-half natural size. 



Fig. 6. Posterior cervical vertebra of Nyctosaurus gracilis, from the side. 

 Twice natural size. 



Fig. 7. Fifth cervical vertebra of Nyctosaurus gracilis, from above. Twice 

 natural size. 



Fig. 8. Lateral carpal of Pteranodon ingens, after Cope. One-half nat- 

 ural size. 



