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THE IGUANODON 
exist that the Megalosaurus was contemporary with 
the Iguanodon. 
Iguanodon The undoubted remains of this 
gigantic herbivorous reptile of the ancient world, 
must be considered as having hitherto been found 
in the strata of Tilgate Forest only ; for although 
some enormous saurian vertebrae and other bones 
have been discovered in the outlying strata of the 
Wealden, in the Isle of Wight, yet as neither the 
teeth, nor bones possessing decided characters, 
have been noticed, their relation to the Iguan- 
odon cannot be positively determined.* The pe- 
culiar characters of the teeth of this animal, their 
analogy to those of the Iguana, and the conclusive 
evidence which they afford of the marvellous fact, 
that the original animal, unlike all other lizards 
either recent or fossil, masticated its food like the 
herbivorous mammalia, are now so well known, 
that it is unnecessary to trespass on the time of 
the Society by describing them. Assuming, then, 
that the Iguanodon bore a closer affinity to the 
Iguana than to any other of the recent genera of 
reptiles, an opinion in which I have the great 
satisfaction of knowing that the late Baron Cuvier 
fully concurred, it is inferred, that all those fossil 
* Dr. Jaeger, the eminent German naturalist, to whose interesting 
researches I had occasion to refer when speaking of the Cylindricodon, 
has found a tooth so like that of the Iguanodon, that he believes it 
to have belonged to the same animal. In a letter, dated August, 1829, 
he observes, — “ J’ai une dent trouvee avec les restes du Mastodon- 
saurus, que je crois etre d’un Iguanodon. Le ‘ sandstone of Til- 
gate Forest ’ nous etoit jusqu’alors iuconmi ; dernierement on m’a 
envoye une piece avec des petrifications de reptiles qui lui ressemhie 
parfaitement, mais je n’en connois pas encore les relations geo- 
logiques.” 
