THE LEVIATHAN AND BEHEMOTH. Vif 



of an unknown herbiverous reptile (the iguanodon), differing from any 

 hitherto discovered either in a recent or fossil state." Griffith, in his 

 translation, says, " So great is the difference between the teeth of 

 the crocodile, the megalosaurus, and plesiosaurus, and so much do they 

 difler from other lizard tribes, that it is scarcely possible to commit 

 an error in their identification. But some other teeth were discovered, 

 in the Summer of 1832, in the sandstone of Tilgate, which, with an 

 obvious indication of/t«r6iv^ows characters, exhibited other peculiarities 

 of so remarkable a kind as to arrest the attention of the most superficial 

 observer, and announce something of a very novel and interesting 

 description. Mr. Mantell made a comparison of these teeth with 

 those of existing lizards in the museum of the Royal College of Sur- 

 geons. The result of this comparison proved most satisfactory : They 

 found in the iguana teeth decidedly analogous to the fossil in confor- 

 mation and structure. 



" From the character of the fossil remains which more immediately 

 surround those relics of the iguanodon, it is concluded that this animal 

 was amphibious, a native of the fresh water, and not of the ocean : 

 calculating on the proportions of the living animal, and supposing the 

 same relative dimensions in the fossil as in the [iguana in relation to 

 its] teeth, the individual which possessed the teeth we have been de- 

 scribing must have been upwards of 60 ft. in length. A similar de- 

 duction has been made by Dr. Buckland respecting the size of the 

 iguanodon, from a femur and other bones in the possession of Mr. 

 Mantell." 



"It would appear, from the researches of Mr. Mantell, that the 

 iguanodon bore on its head a remarkable horny appendage, as lai^e 

 as, and similarly formed to the small horn of the rhinoceros. What 

 he discovered of this is externally dark bro^vn ; some parts of the 

 surface are smooth, others furrowed, as if for the passage of vessels. 

 Its structure is osseous, and there is no external cavity. It does not 

 appear to have been joined to the skull by a bony process, like some 

 horns of mammiferous animals. The homed species are by far most 

 abundant among existing iguanas. The Icjuana cornuta of St. 

 Domingo is like the common species in magnitude, colours, and general 

 form ; but upon the point of the head, between tlie eyes and nostrils, 

 are found four large and bony tubercles ; behind them rises an osseous 

 and conical horn, which is enveloped by a single scale. The fossil 



