953 



stages, European, correlation of, with periods of American formations 43-45 



Stenocephalic, meaning of term _ -. 260 



Sterling, Mrs. Lindsey IMorris, acknowledgment to. - xxiu 



Stevenson-Hamilton, J., quoted 126-127,877 



Sthenodectes Gregory, description of... Pis. LXV, LXVI, 353-354 



original description of 190 



incisivus (Douglass), description of Pis. LXV, LXVI, 354-357 



Stirling, E. C, quoted 867 



Subfamilies, names proposed for 245 



Superfamily names, origin of 243 



Symborodon Cope, origin of name 145 



original description of 209-210 



altirostris Cope, original description of 212-213 



bucco Cope, original description of 212 



copei Osborn, original description of 235 



hypoceras Cope, original description of 216-217 



torvas Cope, original description of 210 



trigonoceras Cope, original description of 213-214 



Taal crater, Philippine Islands, eruption of, plateshowing 140 



Tapiridae, proportions of limbs of 747 



Tapirs, appearance of 69 



habits of, parallel to those of Eocene titanotheres 128-129 



Taxonomy, phyletic terms of, compared with Linnaean 21 



Teeth, adaptation of, to feeding habits 264-266 



arrested evolution in -- 796 



development of 788,789,792 



development and degeneration of 268,270-271 



features of, in brachycephaUc and dolichocephalic skulls. 261 



functions of 794-795 



grinding, mechanism of 269-270 



proportion and rectigradation in 267-268 



harmony of proportions of, with proportions of head 795-796 



rectigradations in. 817-818,819-820 



relation of, to e-\tinction 880-881 



upper and lower, correlation of dimensions of 272 



upper molar, terminology of 263 



Teleodus Marsh, description of PI. XIX, 481 



original description of 227-228 



avus Marsh, description of PI. XIX, 481-482 



original description of. 228 



primitivus (Lambe), description of 482 



Telmatheriinae Osborn, description of 337-340 



skeleton of 652-665 



Telmatherium Marsh, derivation of 830 



description of Pis. XVI, XLVI, LI, LV, LXIII-LXV, 340-341,932-933 



original description of _ 160 



retardation of horns in 790-791 



skeleton of 599-612 



altidens Osborn, description of. PI. LXV, 351-353 



berkeyi Osborn, description of 934-936 



cornutum Osborn, original description of 173-174 



eultridens (Osborn, Scott, and Speir), description of Pis. LV, 



LXUI, LXV, 341-344 



ultimum, bones of 653-655 



description of. Pis. XVI, XLVI, LI, LV, LXV, 345-351 



original description of 184 



validum Marsh, description of PI. LXIV, 344-345 



validus Marsh, original description of 160-161 



Telmatherium? altidens Osborn, original description of _. 184-185 



birmanicum Pilgrim and Cotter, original description of 196-199 



incisivum Douglass, original description of 185-186 



Telmatotherium diploconum Osborn, original description of 173 



diploconum var. minus Matthew, original description of 178 



Terminology, old, retention of 13-14 



Tetrakinesis, quantitative increment of the four factors in 837-838 



theory of.. 835-837 



Tetraplasy, principles of 807-808 



Thiselton-Dyer, W. T., cited... 869 



Tibia, attachments of muscles to 720-7?l 



Tiflany beds, fauna of. 64-65 



Time of the titanothere epoch 4-5 



Titanops Marsh, original description of 224 



curtus Marsh, original description of 224 



elatus Marsh, original description of 224 



medius Marsh, original desciiption of 228-229 



Titanotheriidae Flower, proposed as family name 244 



Osborn, proposed as family name 244 



Titanotherioidea Osborn, proposed as superfamily name... 243 



Titanotherium Leidy, all known forms treated as species of 148 



origin of name xix 



original description of 205-206 



bohemicum Kiernik, description of 941-942 



original description of 240-241 



proutil, discovery and first description of 202-203 



ramosum Osborn, original description of 231 



Titanotherium zone, contact of, with Pierre shale, plate showing 140 



on Cedar Creek, S. Dak., plate showing 140 



Titanotheroidea Osborn, description of 279 



Torrejon beds, Sandoval County, N. Mex., plateshowing 140 



Torrejon formation, fauna of 60,64 



Toula, Franz, first European Oligocene species described by 148 



Transmittal, letter of.. ' xix 



Type specimens, various kinds defined , 153-154 



U 



Uinta A sandstones. White River Canyon, Utah, plate showing 140 



Uinta Basin, Utah, constituents of the rocks of 91 



deposits and fauna of 91-96 



fauna unrepresented in 99 



genera and species represented in 97-98 



Uintatherium zone, description of 85,87 



Ulna, attachments of muscles to 716 



Ungulates, cursorial, appearance of 67-68 



habitat of... 121 



odd-toed, phyla of 24 



Tertiary, eleven orders of 13 



Ursus, parallelisms in study of 19 



V 



Variation among quadrupeds, causes of 127-128 



arrest of, in relation to extinction 885-886 



experiments on 842-843 



Velocity in the development of characters and in phylogeny 39-41 



W 



Waagen, mutations of 19-20 



Wagonbed Spring, Fremont County, Wyo., exposures at, plate showing 140 



Wallace, Alfred K., on natural selection 855-856 



on the balance of nature 859 



quoted 861,879 



Wasatch time, faunas of 64-73 



physiographic and climatic conditions in, favored a modernized fauna. 66-67, 68 



sedimentation during 65-66 



Washakie Basin, Wyo., fatmal zones of 85,87,89 



stratigraphy of. 85,88 



Weckerly, C. A., acknowledgment to xxiii 



White River Canyon, Utah, panoramic view in, plates showing 140 



White River group, definition of 104 



Wind River Basin, Wyo., early Eocene fauna and physiography in 273-274, 



275-276 



explorations and discoveries in — 279 



Wind River formation, fauna of 69-71, 



74, 76-77 



Wood, George M., acknowledgment to xxin 



Wortman, J. L,, collecting by xxn, 150, 151 



quoted 274 



Z 



Zygomatic indices, how obtained 787 



Zygomatic-cephalic indices in the titanotheres 260 



in various perissodacytls 259,260 



o 



