Oriocalotes, ii. [402]

Orioles, ii. [268]

ORIOLIDÆ, ii. [268]

Oriolus, ii. [268]

Orites, ii. [266]

Ornithion, ii. [101]

ORNITHORHYNCHIDÆ, ii. [253]

Ornithorhynchus, ii. [253]

Orocætes, ii. [256]

Orohippus, N. American Tertiary, i. 136