Pterosauria. 



PLATE 4. 



Fig. 

 1 and 2. Wing-bone of Pterodactylus Cuvieri. 



2*. Articular end of ditto : a and b, articular surfaces ; c, fractured surface leading 



to the cavity of the bone. 



3. Portion of the narrowest side of the same bone, showing the pneumatic foramen 



at jo. 

 3*. Section of the same bone four inches from the articular end, showing the thick- 

 ness of its dense osseous wall, and the wide air-cavity. 

 From the Burham Chalk-pit, Kent. In the Collection of J. Toulmin Smith, Esq. 



4. A similar portion of a corresponding wing-bone of Pterodactylus compressirostris, 



nat. size : p, the pneumatic foramen. 

 4*. Part of the articular extremity ; a, articular surface. 

 4**. Transverse section of the smallest part of the shaft. 



From the Burham Chalk-pit, Kent. In the Collection of Jas. S. Bowerbank, 

 Esq., F.R.S. 



5. Portions of the shafts of the radius and ulna of Pterodactylus compressirostris, 



nat. size. 

 5.* The somewhat crushed and mutilated articular ends ; d, articular surface. 



From the Burham Chalk-pit, Kent. In the Cabinet of Mrs. Smith, of 

 Tonbridge Wells. 



