Breweri_, 360, 363
Heliodus, an American fossil, 69
Helix, 17
Hemiptera of St. Helena, 303
Hepaticae, peculiar British, 366
non-European genera of, in Britain, 367
Hesperomys, 26
Hesperornis allied to ostriches, 481
_Hieracium iricum_, 362
High land essential to the production of a glacial epoch, 195
Hildebrand, Dr. W., on flora of the Sandwich Islands, 321
Himalayan birds and insects in Celebes, 462
Hippopotamus in Yorkshire as proving a mild climate, 119
Hochstetter on the aquatic mammal of New Zealand, 475
{556}
Hooker, Sir Joseph, on the Galapagos flora, 287
on affinities of St. Helena plants, 306
on peculiar British plants, 360, 363
on the flora of New Zealand, 488
on proportion of temperate and tropical Australian floras, 492
on current of vegetation from north to south, 510
on supposed occurrence of Australian plants in England in the Tertiary
period, 518
Horne, Mr. John, on ice-sheet covering the Isle of Man, 115
Hull, Professor, on Permian breccias in Ireland indicating ice-action,
201
Humming-birds, restricted ranges of, 16
Hutton, Captain, on struthious birds of New Zealand, 479
Huxley, Professor, on geological time, 211
on European origin of African animals, 419
Hyomoschus, 27
Hyracoidea, restricted range of, 30

I.
Ice-action, what evidences of, during the Tertiary period, 178
indications of ancient, 200
Ice-borne rocks, a test of a glacial epoch, 176
in Miocene of N. Italy, 178
in Eocene of Alps, 178
in Eocene of Carpathians and Apennines, 179
absence of, in English and N. American Tertiaries, 180
Ice-cap, why improbable or impossible, 161
Iceland, a continental island, 450
Icteridae, 50
Iguanidae, 50
Indian birds in Formosa, 407
Indian Ocean as a source of heat in Tertiary times, 192
Indian genera of plants in Australia, 492
Indicator, distribution of, 25
Insectivora in Madagascar, 417
Insects, dispersal of, 77
of the Miocene period, 77
restriction of range of, 78
of the Azores, 253
of Bermuda, 269
of the Galapagos, 284
of St. Helena, 298
of the Sandwich Islands, 318
peculiar British, 344
of Celebes, peculiarities of, 462
scarcity of, in New Zealand, 505
Insular faunas, summary of conclusions as to, 539, 542
Interglacial warm periods on the continent and in North America, 121
Interglacial perio