GIANT LAND REPTILES OR DINOSAURS. 115 



panying woodcut (Fig. 32). These teeth have pecu- 

 liarly compressed crowns, with well-marked flutings 

 on the outer surface, and serrated lateral edges. In 

 many of them the summits of the crowns are found to 

 be worn quite flat by mutual abrasion ; from which 

 it is evident that these teeth indicate a reptile of 

 herbivorous habits, which was also of gigantic size. 

 From the somewhat distant resemblance presented by 



FIG. 32. Outer side and profile of the crown of a tooth of the Iguanodon. 

 Natural size. 



them to the very much smaller teeth of a living 

 American lizard known as the Iguana, Dr. Mantell 

 proposed to call the huge Wealden monster the Iguana- 

 toothed Eeptile, or Iguanodon. In the course of time 

 numerous more or less nearly entire bones of this 

 creature were obtained, when it was found that the 

 thigh-bone of some specimens considerably exceeded 

 a yard in length. This at once gave a clue to the 



