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Dinoceras, dī-nos′er-as, n. an extinct genus of mammals found in Wyoming, approaching the elephant in size, and named from three pairs of osseous protuberances on the skull.

In the Middle Eocene, the place of Coryphodon was taken by Dinoceras and allied forms.

Fore-foot of Dinoceras 217 175.

The Coryphodon was horrified; The Dinoceras was shocked; And they chased young Eohippus, But he skipped away and mocked.

The black herds of the Dinoceras stopped feeding all at once, and raised their vicious heads and stared.