A skeleton
mount from these specimens will shortly be constructed for the
Cretaceous Dinosaur Hall.
_Scelidosaurus, Polacanthus, etc._ Various armored dinosaurs, of
smaller size and less heavily plated, have been described from the
Jurassic, Comanchic and Cretacic formations of Europe. The best known
are _Scelidosaurus_ of the Lower Jurassic of England, and
_Polacanthus_ of the Comanchic (Wealden). _Stegopelta_ of the
Cretaceous of Wyoming is more nearly related to _Ankylosaurus_.
CHAPTER IX.
THE BEAKED DINOSAURS (Concluded.)
D. THE HORNED DINOSAURS, TRICERATOPS, ETC.
_Sub-Order Ceratopsia._
In 1887 Professor Marsh published a brief notice of what he supposed
to be a fossil bison horn found near Denver, Colorado. Two years later
the explorations of the lamented John B. Hatcher in Wyoming and
Montana resulted in the unexpected discovery that this horn belonged
not to a bison but to a gigantic horned reptile, and that it belonged
not in the geological yesterday as at first thought, but in the far
back Cretacic, millions of years ago. For Mr. Hatcher found complete
skulls, and later secured skeletons, clearly of the Dinosaurian group,
but representing a race of dinosaurs whose existence, or at least
their extraordinary character, had been quite unsuspected. It appeared
indeed that certain teeth and skeleton bones previously discovered by
Professor Cope were related to this new type of dinosaur, but the
fragments known to the Philadelphia professor gave him no idea of what
the animal was like, although with his usual acumen he had discerned
that they differed from any animal known to science and registered
them as new under the names of _Agathaumas_ 1873 and _Monoclonius_
1876.
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