These
skeletons, unique in their occurrence and manner of discovery, are the
pride of the Brussels Museum of Natural History, and, together with
the earlier discoveries, have made the _Iguanodon_ the most familiar
type of dinosaur to the people of England and Western Europe.
[Illustration: Fig. 27.--Teeth of the duck-billed dinosaur
_Trachodon_. The dental magazine has been removed from the lower
jaw and is seen to consist of several close-set rows of numerous
small pencil-like teeth which are pushed up from beneath as they
wear off at the grinding surface.]
_Camptosaurus._ The American counterpart of the Iguanodons of Europe
was the _Camptosaurus_, nearly related and generally similar in
proportions but including mostly smaller species, and lacking some of
the peculiar features of the Old World genus. In the National Museum
at Washington, are mounted two skeletons of _Camptosaurus_, a large
and a small species, and in the American Museum a skeleton of a small
species. It suggests a large kangaroo in size and proportions, but the
three-toed feet, with hoof-like claws, the reptilian skull, loosely
put together, with lizard-like cheek teeth and turtle beak indicate a
near relative of the great _Iguanodon_.
_Thescelosaurus._ The Iguanodont family survived until the close of
the Age of Reptiles, with no great change in proportions or
characters. Its latest member is _Thescelosaurus_, a contemporary of
_Triceratops_. Partial skeletons of this animal are shown in the
Dinosaur Hall; a more complete one is in the National Museum.
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