226 



EXTINCT OEDEKS OF REPTILES. 



With regard to the affinities of the Pterosauria, and their 

 precise systematic position, scientific opinion is still not ab- 



Fig 573. — A, Fore-limb of Pterocki.ctylus 

 crnssirostris : Ji, Humerus ; r, Radius ; u, 

 Ulna ; c, Carpus ; i, ii, lii, iv, Digits, b, 

 Sternum of Fterodactyle, showing the 

 median keel. 



Fig. 574. — Skeleton of Dimorplwdott, 

 mucronyx, reduced in size and restored 

 (after Owen), m. Hand ; /, Elongated 

 finger carrj'ing the patagium ; p, Foot. 

 Lias. 



solutely nnanimous. That they possessed the power of true 



