Tylopoda, [285] f.

Typhlomys, [471]

Typotheria, [212] f.

Typotherium, [213]

Uintacyon, [424]

Uintatherium, [210]

Unau, [170], [171]

Ungulata, [195] f.

Urinary organs, [68]

Uromys, [473]