EXTINCT ANIMALS 



years ago by a celebrated and most delightful 

 collector and explorer of the earth's crust, Dr. 

 Gideon Mantell, in the strata known as the 

 Wealden in Sussex, just below the Chalk and 

 Greensand (see table of strata). Dr. Mantell 

 found that the teeth, of which two are here 

 represented of the natural size, were those of a 



Fig. 144. — A portion of the upper jaw of the recent Hzard 

 Iguana, showing the serrated edges of the»teeth, similar to 

 those of Iguanodon. 



herbivorous animal and like those of the little 

 Hving lizard from South America, called the 

 Iguana, in the fact that the broad chisel-like 

 crown has a saw-like edge (Fig. 144). From 

 this fact the name Iguanodon (Iguana-toothed) 

 was given to the new fossil giant reptile. The 

 bones found by Mantell and others were scat- 

 tered and not in their natural position and the 



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