THE PTEEOSAUBIA. 271 



b. The extremities of the jaws produced into toothless beaks, 

 probably ensheathed in burn. The tail very long. The 

 metacarpus shorter than half the length of the ante- 

 brachium. 



a. xVU the mandibular teeth similar. 



Bliamphorhi/nchus. 



b. The posterior teeth for the most part very short. 



The anterior long. 



Dimorphodon. 



I am mucli inclined to suspect that the fossil upon whicli 

 the genus Ornithoptcrus has been founded, appertains to a 

 true Bird. 



