949 



Page 



) titanotheres, pioneer discoveries of 149-150 



reclassification of subfamilies of. 246 



size and proportions of 584-585 



types of skull of-- - 264 



upper, skeleton of. 635-662 



EoWppus, appearance of- 68-69 



Eohippus-Coryphodon zone, Clark Fork Basin, Wyo., plate showing 140 



Eometarhinus Osborn, description of 419-420 



original description of 200 



huerfanensis Osborn, description of 420 



original description of 200 



Eotitanopinae Osborn, description of-- 288-289 



Eotitanops Osborn, appearance of, in early Eocene time 70,273 



descent from 830-833 



description of- Pis. XXVI, LIV, 289-290 



original description of 179 



resemblances to and differences from Lambdotherium 276-278 



skeleton of. 591, 593 



borealis (Cope), description of _ PI. LIV, 292-295 



skeleton of- 593-597 



brownianus (Cope), description of 292 



gregoryi Osborn, description of- - - -- PI. LIV, 291-292 



original description of 192-193 



size of - 693 



major Osborn, measurements of bones of 597-598 



description of - 296 



original description of --- 193-194 



minimus Osborn, description of 296 



original description of _ --- _ 199 



osborni, skeleton of .- 656-662 



princeps Osborn, description of Pis. XXVI, LIV, 295-296 



original description of _ 193 



skeleton of 593-.OT 



Eotherium Leidy, original description of 207 



Eotitanotherium Peterson, description of PI. LXXXI, 435 



original description of 196 



skeleton of _ 656-662 



osborni Peterson, description of 435-438 



skeleton of, compared witb that of Dolichorhinus longiceps 649-651 



Epidemics, influence of, on extinction of animals _ - 871-874 



Equidae, proportions of limbs of- 753-754 



Europe, early discoveries in 148 



titanotheres of 941-942 



transitional titanotheres in the Eocene of 382-383 



western correlation of early Tertiary events in, with those of the Rocky 



Mountain region 43-45 



Evolution, adaptive, of bones and teeth - 27-28 



cause of _ 27,849-860 



course of ttt 



key to, found in changes of characters 261 



not a reversible process 883 



of mammals, stability of _ 4 



of the titanotheres, summary of _ __ 41-42 



phyletic divergence in 28-32 



poljTihyletic, features of.-- 10 



rapidity of 10 



Extinction, causes of -__ 854-855 



climatic causes of 861-867 



external and internal causes of, compared 877 



history of opinion on - 866-8C0 



influence of plants on 



of the titanotheres, special features of-.- 



operation of, in different epochs 862-853 



physiographic causes of 860-861 



relation of bulk to 878-880 



various features of - 853-864 



Face, differences in proportion and angle of, to cranium 256-257 



muscles of 70.3-705 



Family names, orign of - 24'l-244 



Feeding habits, adaptation of teeth tO-- 264-266 



of antelopes, adaptive radiation in 126-127 



Feet, evolution of : 33-34 



Femur, attachments of muscles to 718-719 



Femur and humerus, analogous adaptation in __, 742 



Fibula, attachment of muscle to - 721 



Foot, structure of.- - 769-774 



Fore limb, muscles of - - 714-717 



Forestation, influence of, on e.xtinction of animals 867-86S 



Fort Union flora, climate during life of 45,47 



Fort Union formation, fauna and origin of - 60 



Freeh, Fritz, quoted -.- - 861-862 



G Page 



Garman, S., collection made by ' xsil 



Gashato formation, fauna of.. 913 



Genera, four distinguished.. ___ 149 



Geographic range, vertical, of quadrupeds 129 



Geography, Eocene, of western North America 47,49-56 



Germ evolution, nature and progress of .-- 806-807 



Gidley, James W., acknowledgment to xxni 



Gilmore, Charles W., acknowledgment to xxni 



Glands, allometrons influenced by secretions of--_ _. 848-849 



Granger, Walter, acknowledgment to xxii 



collecting by xxn, 162 



"Gray Bull beds," fauna of --- 69 



"Gray Bull" locality, south of Otto, Wyo., plate showing 140 



Great Plains, western, theories of deposition on 104-106 



Green River time, deposition diuring - 71 



flora of --- --- - 72-73 



Gregory, WUliam K., acknowledgments to xix, xxn,2xra 



Principles otleverage and muscular action - 727-731 



Summary of harmonic and differential allometrons in the skulls and feet 



and an interpretation of the phylogeny of the titanotheres 828-833 



The muscular anatomy and the restoration of the titanotheres , 703-725 



Grizzly Buttes, south of Mountain View, Wyo., plateshowing 140 



H 



Habitat zones of mammals described 129-132 



Habitats of lower Oligocene mammals 120,121,132 



of the titanotheres, conclusions on 132 



Haplacodon Cope, original description of-- 225 



Hatcher, John Bell, collection and study by xix, xxn, 116, 147-148, 161-152 



quoted 107,109,112 



Hayden, Ferdinand V., subdivision of the Eocene and Oligocene by 5-6 



Haystack Mountain, Sweetwater County, Wyo., plate showing -_- 140 



Heads of titanotheres, restorations of 706-709 



Helotherium procyoninum Cope, description of 246 



Henrys Fork Table, Bridges Basin, Wyo., plate showing-.. 140 



Heredity germ, evolution of 805 



Heterotitanops Peterson, original description of 196 



parvus Peterson, original description of 196 



Hind limb, muscles of - - 717-722,724 



Holland, W. J., acknowledgments to... xxm 



Holotype, definition of -.. 163 



Hornaday, William T., quoted 868 



Horns, genesis and development of 788-793,814-817 



origin and structure of _. 26fr-267 



Horses, evolution of proportions of skull in.- 28-32 



Houldjtn formation, fauna of --- 907-908 



Howorth, Henry H., quoted 857,871 



Hsanda Gol formation, nature and fauna of-- 905-906 



Huerfano Basin, Colo., fossils of the Landotherimn zone in 274 



Huerfano formation, fauna and other features of 74,76 



Huerfano locality, west of Gardener, Colo., plateshowing - 140 



Humerus, attachments of muscles to 714-715 



forms of -- 741-742 



Humerus and femur, analogous adaption in 742 



Hung Kureh formation, nature and fauna of- 903-904 



Hungary, Eocene titanothere discovered in.. 150 



Hyracodontidae, proportions of limbs of 750-763 



Ilium, forms of -.. 743-745 



length of- - - 746-747 



Illustrations, sources of xxm 



Immimity, influence of, on the extinction of animals 877-878 



Increase of animals, percentages of- _ 880 



Insects, influence of, on extinction of animals - 869-871 



Investigations made for this monograph -. 152 



Irdin Manha formation, nature and fauna of .-- 911-912 



Ischium, length of - 746 



Jennings, H. S., quoted -.. 843 



Johannsen, Albert, acknowledgment to xxn 



Johannsen, W., pure-line principle of- 842 



Laclede station, Wyo., view southeast from, plate showing 140 



Lamarck, Jean Baptiste de, explanation of variations by 834,836,849 



Lamdotheriidae Cope, proposed as family name 244 



Lambdotheriinae Osborn, description of 279 



Lambdotherium, Cope, appearance of, in early Eocene time 69, 70, 273 



description of- - PI. LIV, 279-280 



original description of -- - 168-166 



resemblances to and differences from Eotitanops - 276-278 



