Fig. 155. Limbs: A, /iraeosceiis iProtorosauna). Three fourths natural size. B,Ha/lopus (Dino- 

 sauria). After Marsh. One half natural size. C, Pteranodon (Pterosauria). About one thirdl 

 natural size. D, Pteranodon. About five sixths natural size. 



IQO 



