The Geographical Distribution of Animals, Volume 1 / With a study of the relations of living and extinct faunas as elucidating the past changes of the Earth's surface

by Alfred Russel Wallace

Oriental and Palæarctic faunas once identical, 362

Oriental and Ethiopian faunas, cause of their resemblances, 363

Orohippus, N. American Tertiary, 136

Ostrich, Miocene of N. India, 162

Otaria, European Miocene, 118

Ovibos, N. American Post-Pliocene, 130

Oxen, birthplace and migrations of, 155

Palæarctic, 182

Oxyæna, N. American Tertiary, 134

Oxygomphus, European Miocene, 118