Chœropotamus, European Eocene, 126
Chœrotherium, Indian Miocene, 122
Choneziphius, European Pliocene, 112
Chough, Alpine, figure of, 195
Circumpolar zones, objections to system of, 67
Classification as affecting the study of distribution, 83
Clausilia, Eocene, 169
Climate, as a limit to the range of mammalia, 11
gradual change of, before the glacial epoch, 41
Coleoptera, families selected for study, 103