234 



EVOLUTION IN THE PAST 



Great Britain separated, 213 

 Grebes, iii, 150 

 Greenland, 154 

 Ground-sloths. See Sloths 

 Grouse, Sand, 151 

 — Willow, 200 

 Guillemots, i65 

 Gulls, 150, 166 



Gymnospenns. See Cycads, Conifers, 

 and various names 



H 



Hadrosaurus, 100 



Hag-fishes, 35 



HaUtherium, 150 



Halysites, 29, 47 



Hares, 148 



Hartebeest, 178 



Hatteria. See Sphenodon 



Heart-urchins, 109 



Hedgehogs, 148 



Helicotoma, 24 



HeUadotherium, 170 



Hemiaspis, 34 



Hemipters, 27 



Hermit-crabs, 137 



Heron, 131, 166 



Herring, 76, 105 



Hesperornis, 112 



Heterocercal tail, 42 



Himalayas, 138 



Hipparion, 170, 175, 182 



Hippidium, 203 



Hippopotamus, 177, 182, 189, 193 



Hippurites, 108 



Hoatzin, 3 



Holoptychius, 41 



Holothurians, 13, 17, 54 



Homo. See Man 



Homocercal tail, 41, 58, 64, 76, 88 



Hoopoes, 151 



Hoplopteryx, 106 



HornbUls, 132 



Hornets, 152 



Horse-mackerel, 106 



Horses — 



Eocene, 120 



Ohgocene, 143 



Miocene, 159 



Pliocene, EarUer, 170, 175, 180 



Horses (cont.) — 



Pliocene, Later, 182, 185 



Pleistocene, 189, 193, 203 



Domesticated, 213 



Keltic tjrpe, 182 



South American, 203 



Thoroughbred, 176 

 " Horsetails." See Equisetales 

 Hyaena, 173, 184 

 Hyaenodon, 128, 146, 156, 173 

 Hydra, 12 

 Hydrozoa. See Cladophora, Grapto- 



lites 

 Hymenocaris, 19 

 Hyopotamus, 144 

 Hyracodon, 142 

 Hyxacotherium, 121 

 Hyrax, 129 



Ibis, 131, 150 

 Ichthyomis, 112 

 Ichthyosaurs — 



Triassic, 79 



Jurassic, 95 



Cretaceous, 102 

 Iguanodon, 98 

 Implements — 



Eolithic, 188 



PalasoUthic, 195, 198, 199 209 



NeoUthic, 212, 213 



Bronze, 214 

 India, Early PUocene, 173 

 Inostransevia, 63, 77 

 Insectivores — 



Jurassic, 97 



Eocene, 118 



Oligocene, 148 



Miocene, 155 



{See also Hedgehogs, Moles, Shrews.) 

 Insects — 



Ordovician, 27 



Devonian, 47 



Carboniferous, 52 



Triassic, 71 



Jurassic, 89 



Cretaceous, 114 



Oligocene, 157 



{See also various names.) 

 Inter-glacial Epoch — 



Europe, 192 



