Otocorys, ii. [289]

Otocryptis, ii. [402]

Otogyps, ii. [346]

Otomys, ii. [230]

Otopoma, ii. [521]

Ovibos, N. American Post-Pliocene, i. 130

ii. [224], [225]

Owl-parrot, ii. [329]

Owls, ii. [350]

Oxen, birth-place and migrations of, i. 155