In Trachodon (see p.

94), we know that the skin bore neither feathers nor overlapping scales but had a curiously patterned mosaic of tiny polygonal plates and was thin and quite flexible.

Some such type of skin as this, in default of better evidence, we may ascribe to the Allosaurus.
[Illustration: Fig.

13 .-- View in the Hell Creek badlands in central Montana, where the Tyrannosaurus skeleton was found.] As to its probable habits, it is safe to infer (see p.

33), that it was predaceous, active and powerful, and adapted to terrestrial life.
Its methods of attack and combat must have been more like those of modern reptiles than the more intelligent methods of the mammalian carnivore.