The Dinosaurs of Wyoming - Wyoming State Geological Survey ...

THE ARMOURED DIKOSAURIA 73
of pentagonal, osseous plates, highly ornamented and looking
somewhat like the body armor of some of the glyptodonts
found fossil in South America.
All armored dinosaurs are plant-eaters, the anterior "beak"
being provided with a horny sheath for cutting off leaves,
twigs and succulent stems, as in the three-horned dinosaurs.
Often the entire group are spoken of as "the beaked dinosaurs."
The duck-billed dinosaur, Trachodon, with its amaz-
FIGURE·21.
Casts of endocranial and sacral cavities of the Stegosaurus, showing proportions
of brain (above) and sac