948 i^ 



Page 



Brontotherium medium (Marsh), description of. Hs. XIX, 



XX, CLXXII, CLXXVI, CLXXX, 673-574 



platyceras (Scotland Osborn), description of.. P's. XVIII, 



XIX, CLXXXI, CLXXXII, CLXXXVII-CLXXXIX, 578-581 



ramosum (Osborn), description of PI- CXCi, 577-578 



robustus, restoration of - - '25 



slieletonof 666-009,676 



tichoceras (Scott and Osborn), description of -- PI. CLXXXVII, 665-667 



Brontotherium phylum, measurements in - - 653-554 



Brontotherium? rumelicum (Toula), description of - 660-562 



Brown, Arthur E., cited - 884 



Browsing and grazing species, groups of - 120 



Biichner, Eugen, quoted - -- - ^''^ 



Bulk, relation of, to the extinction of animals _. 878-880 



Bunoselenodont families of perissoda^tyls, descent of-. - — 779 



Canadian species described by Cope, original descriptions of. 219, 225-227 



Canadian species described by Lambe, original descriptions of 235-240 



Canidae, descent and relationship of species of. 18-19 



Canis montanus Marsh, original description of 158-159 



Canis? marshii Hay, original description of 178 



Carpus, attachments of muscles to 710-717 



Catalyzers, influence of, on allometrons 848,849 



Causes and modes, distinction between 805-806 



Causes of evolution, speculation on -- 806 



Cervus, species and habitats of -- - 18 



Chadron formation, exposure of, plate showing _ HO 



geograpliic distribution of 110-112 



three faunistic levels determined in __ 113 



Chalicotheriidae Cope, proposed as family name 244 



Characters, new, appearance of 22-23 



origin of, disiinguished from changes in proportion 34-39 



single, evolution of 22-23 



steps in transformation of 262,254 



Chesnut, Victor K., cited 868,869 



Christraan, Erwin S., acknowledgment to -- sxm 



Classification, adopted in this monograph 247-249 



phyletic application of the Linnaean system of 243 



phylogenetic, relation to the Linnaean classification 15-18 



terms used in, definitions of - 243 



Climate, influence of, on extinction,. -- 861-867 



late Cretaceous and early Tertiary 45-47,48 



Competition with other ungulates. __ -- 10-12 



Condylarthra, relation of, to the line of descent of the Perissodactyla 768-760 



Cook, James H., quoted- -. xxi-xxn 



Cope, Edward D., collection and description by - 145 



quoted _ -- 883 



work of - XXI, xxra, 146, 150 



"Coryphodon beds," five life zones of 12 



Cotype, definition of - 153 



Coyote Basin, Utah, northern boundary of, plates showing. 140 



Crampton, C. B., quoted, ._ - - 886 



Craniometry, summary as to 256 



Cranium, differences in proportion and angle of, to face. 256-257 



Culbertson, Thaddeus A., collection made by 143 



Gumming, Gordon, quoted -- 871 



Cursorial ungulates, appearance of — 67-68 



Cuvier, Georges, quoted 856 



Cyptocephaly, range and importance of 256-257 



Daeodon shoshonensis Cope, description of 246-247 



Dana, James D., and Silliman, Benjamin, quoted 202 



Darton, Nelson H., quoted 112 



Darwin, Charles, explanation of variations by j.. 835,839-849,849 



on natural selection 865-856 



on the balance of nature 859 



quoted - 870,880 



Definitions, Linnaean style of 14 



of terms used in classification 243 



Deposition of sediments, rate of.. 44 



Descent, plural lines of, recognized -,^ 14-15 



Development, ontogenetic, velocity in.. 40 



phylogenetic, velocity in._ 40-41 



"Diconodon non Anisacodon" Marsh, original description of !:17,219 



Diet, change of, influencing evolution of teeth 796 



Diplacodon Marsh, description of. _ Pis. LXXXI, LXXXII,439 



original description of.. 166 



amplus Marsh, description of Pis. CVIII-CX, 504-505 



bicornutus (Osborn), description oL. Pis. CIV, CVII, 601-602 



Page 



Diplacodon elatus Marsh, bones of - 665-666 



elatus Marsh, description of Pis. LXXXI, LXXXII, 439-442 



original description of 166 



emarginatus Hatcher, original description of. 177 



selwynianus (Cope), description of 602 



Diplacodon zone, south of White River, Utah, plate showing 140 



Diplacodontinae, description of 434 



skeleton of 662,666-602 



Diploceras Peterson, original description of. 195-196 



Diploclonus Marsh, description of Pis. XXXVII, CIV-CX, 499-601 



original description of 227 



skeleton of 676-678 



amplus Marsh, original description of 227 



tyleri (Lull), description of Pis. XXXVII, CV-CVIII, 502-604 



skeleton of 675-678 



Diploclonus phylum, features of.. 473,476-476,479 



Discovery, first, of a bone of a titanothere 1 



of the Oligocene titanotheres 141-149 



Distribution, geographic 1 



Divergence, phyletic, in evolution of new proportions 28-32 



Divisions of the monograph 2 



Dolichocephaly, domination of shape of teeth and skull bones by 267-259 



Dolichorhinae Riggs, proposed as subfamily name.. 246 



Dolichorhininae Riggs, comparison of, with Manteoceras 384-385 



convergence or kinship control in 386 



discovery and classification of 383-384 



divergent or independent evolution of character groups in 386 



dolichocephaly and cyptocephaly in the Mesatirhinus-Dohchorhi- 



nus phylum 385-386,386-387 



phyla and relations of - 383 



skeleton of .-- 630-652 



species of, in the upper Huerfano 297 



Dolichorhinus, Hatcher, description of Pis. XVII, 



XXIX-XXXII, XLVI, LII, LIIl, LV, LXXI-LXXVII, 396-400, 918-919 



evolution in proportions of skull and teeth of - 827-828 



measurements of species of 404,407,408 



original description of 177 



skeleton of. 699-612,646-662 



fluminalis Riggs, description oL.. Pis. LXXV-LXXVII, 417 



original description of 191-192 



heterodon Douglass, description of PI. LXXIII, 416-417 



original description of 187-188 



hyognathus (Osborn), description of Pis. XVII, 



XLVI, LII, LIII, LV, LXXI, LXXII, 409-416 



skeleton of. 645-648, 662 



intermedins Osborn, description of PI. LXXIII, 405-406 



original description of 184 



kaiseni Osborn, description of 919-924 



longiceps Douglass, description of. Pis- XXX-XXXII, 



LXXIII, LXXV-LXXVII, 406-409 



original description of - 188-189 



skeleton of. 640-562 



olseni Osborn, description of 919 



(Mesatirhinus) superior, Riggs Pis. LXXV-LXXVII, 405 



valUdens (Cope), description of. PI. LXXIV, 401-404 



D'Orbigny, Alcide, cited 856 



Douglass, Earl, collecting by... xxii 



acknowledgment to - XXIII 



E 



Earle, Charles, revision of the Palaeosyops group by 160 



Embolotheriinae Osborn, description of. 942-943 



Embolotherium Osborn, description of --- 943-944 



Environment, life, influence of, on evolution 807-808 



physical, efiects of changes in. .- 127 



influence of, on evolution 807-808 



Eocene epoch, length of 12 



early, general correlation in 65-68 



geographic and biotic conditions at the end of 273-276 



summary of faunal events in - 60,63 



transitional faunas of 64-65 



middle and late, American life zones of, correlated with European 



stages 77-78 



Eocene titanotheres, evolution of skull of, with relation to skull of Oligocene 



titanotheres 786-787 



genetic relations of, to Oligocene titanotheres 407,468-469 



geologic succession and geographic distribution of. 272-273 



list of original descriptions of... - 156-166 



lower, measurements of skeleton of 590-598 



systematic descriptions of. 279-296 



middle, evolution of skeleton of-. 698-636 



middle and upper, phyla distinguished 297 



systematic descriptions of.. 297-441 



