All herbivorous, with pelvis of peculiar type, with hoofs instead of claws, and many genera heavily armored.

Mostly three short toes on the hind foot, four or five on the fore foot.

This group comprises animals of very different proportions as follows: 1.

_Iguanodonts._ Bipedal, unarmored, with a single row of serrated cutting teeth, three-toed hind feet.

Upper Jurassic, Comanchic and Cretacic.