range of Australian genera of, 485

Struthious birds, probable origin of, 287

Stylinodontidæ, N. American Eocene, 139

Stylinodontia, N. American Eocene, 139

Sub-regions, on what principle formed, 80

Palæarctic, 191

Ethiopian, 258

Oriental, 321

Australian, 408

Suidæ, European Miocene, 119