PLYING DRAGONS, OR PTERODACTYLES. 145 



noticed did nofe 

 exceed a rook in 

 size, some of the 

 Pteranodonts were 

 of enormous di- 

 mensions, one of 

 them having a 

 skull measuring 

 upwards of four 

 feet in length, and 

 its expanse of wing 

 being probably 

 about twenty-five 

 feet. These Ptera- 

 nodonts are found 

 in the chalk of the 

 United States ; 

 but species nearly 

 as large occur in 

 the chalk of this 

 country, although 

 they were fur- 

 nished with a 

 powerful armature 

 of teeth, and have 

 been described 

 under the uncouth 

 and exceedingly 

 misleading name 

 of Ornithochirans 



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