952 



Page 



5 major Leidy, description of PJs. LVII, LXII, 321-323 



major Leidy, original description of 15S 



skeleton of - 620 



manteoceras Matthew, original description of 177-178 



megarhinus Earle, original description of 170-171 



minor Marsh, description of 246 



minor Earle, original description of -- 171-172 



paludosus Leidy, description of.. ..Pis. LII, LVI, LVIII, LIX, LXII, 319-321 



errors in describing - 153, 154 



Leidy's cotypes and paratypes of 157 



original description of 157-158 



Osborn's neotype of 157-158 



robustus Marsh, description of Pis. LV, LVI, LVIII, LXII, 331-335 



skeleton of 626-629 



ultimus Matthew, original description of 177 



yallidens Cope, original description ofj 162-163 



Palaeosyops generic phylum, characters of, common to Linmohyops phylum 301-302 



separation of, from that of Linmohyops 298-301 



Palaeosyops group, revision of, by Earle -. 150 



Palaeotheriidae, proportions of limbs of.. 747-749 



Palaeotherium, reference of first specimen to 141 



giganteum Leidy, original description of 207-208 



maximum Leidy, original description of _. 206 



Palaeotherium? proutii Owen, Norwood, and Evans, original description of. 206 



Palate, evolution of 788 



Palmer, T. S., quoted 876,877 



Pang Kiang formation, features of 904-905 



Paratype, definition of-. 154 



Patella, attachments of muscles to 720 



Pelvis, attachment of muscles to 717-718 



Percy, IMabel Rice, acknowledgment to ssm 



Perissodactyla, ancestral, nature and habitat of 757-758 



convergence of, in habitat and habit. 778-779 



geographic distribution of 24-27 



mechanics of the menus of 774-776 



primitive, character of 760 



skull of 764-768 



tetradactyl manus of 762-763 



phylogeny of families of. 23-24 



possible origin of i... 758-760 



structure of the foot in 769-774 



summary of evolution of 776-778,779-780 



Pes, attachment of muscles to... 721-722,724 



evolution of ^ 800 



Peterson, O. A., acknowledgment to xxni 



collecting by xxn, 151 



quoted 649-651,656-662 



Phenacodus-Nothodectes-Coryphodon zone, north of Ralston, Wyo., plate 



showing 140 



Phyla, division of Oligocene titanotheres into 245-2-46 



evolutionary characters of 21 



features distinguishing 19 



Physiographic changes, effect of, on extinction 860-861 



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



Plains, discovery of remains in 6 



geographic history of 51,53 



Plants, influence of, on extinction of animals 867-869 



Plate, L., quoted 885-886 



Plateau region, geographic history of 51 



Polyphyly among hoofed mammals 121-123 



among quadrupeds, causes of 127-128 



interpretation of descent by 14-15, 148-149 



local, caused by reunion of phyla 127-128 



Premolars, molarization of 270-271 



Prichard, H. Hesketh, quoted 863 



Primitive titanotheres, shown to be subcursorial 799-800 



skull of 768 



Princeton University, explorations by 150 



Principles, geologic and anatomic, summary of xxiii-xxiv 



Proportion characters, changes in, origin and results of 22,820-822 



use of, in tracing development 251-252 



Proportional reversal principle, appUcation of, to the titanotheres 830-833 



Proportions of skeleton, terminology indicating 822-823 



Protitanotherium Hatcher, characters of... 374 



derivation of.- 830 



description of. Pis. LXVIII, LXIX, 375, 377, 924-925 



original description of 176 



andrewsi Osborn, description of 930-931,932 



emarginatum Hatcher, description of Pis. LXVIII, LXIX, 377-379 



grangeri Osborn, description of 926-928,931-932 



mongoliense Osborn, description of 928-930, 932 



superbum Osborn, bones of 655 



description of.... PI. LXIX, 379-381 



original description of ._ 185 



Prout, Hiram A., discovery and description by, of the first titanothere known 



to science 141,202-203 



work of 1 



Puerco formation, e.\posures of, plates showing 140 



fauna of 60,63 



sedimentation of. 63-64 



Punnett, R. C, quoted 841 



Quadrupeds, other, relation to 12-13 



Quinn Draw, S. Dak., exposures at, plate showing. 140 



H 



Radiation, adaptive, in the Uinta Basin 98-99 



adaptive, process and results of 123-128 



Radius, attachmenfs of muscle,^ 1o 715 



Rectigradations, contrast of, with mutations of Waagen... 818-819 



correlation of 834 



definition of 252,812 



origin of 834-836 



principles governing 814-820 



resemblances to and differences from allometrons.. 813-814 



Researches made for this monograph xix, xxn, xxiii 



Restorations of heads of titanotheres 705-709 



Retrogression, features of 23 



Reversing in evolution of allometrons 833 



Rhadinorhininae(=?Megaceropinae), description of 429-430 



Rhadinorhinus Riggs, derivation of 832-833 



description of Pis. LXXIV, LXXX, LXXXII, 430 



original description of 192 



abbotti Riggs, description of PI. LXXX, 430-431 



original description of 192 



diploconus (Osborn) , description of Pis. LXXIV, LXXXII, 431-434 



Rhinoceros, black, habits of 128 



white, habits of.. 128 



americanus Leidy, original description of 206-207 



Rhinoceroses, Asiatic, habits of 128 



habits of, parallel to those of Oligocene titanotheres. 128 



Rhinocerotidae, proportions of limbs of . 750-753 



Riggs, Elmer S., collecting by xxii, xxni 



Ripley, H. Ernestine, acknowledgment to xxui 



Rodents, appearance of 68-69 



Sacrum, attachment of muscles to 717 



Saltations, abnormal nature of 840-841 



place of, in Darwin's theory 839-840 



"Sand Coulee beds," fauna of.. ... 68-69 



Saskatchewan, rapid Quviatile sedimentation in 109 



Scapula, attachments of muscles to 714 



forms of 740-741 



Schuchert, Charles, acknowledgment to. xxin 



Scott, William B., acknowledgment to xxm 



and Osborn, Henry F., study of Garman collection by 146-147 



and Speir, collecting by 150 



Sex, correlation of horns with 793 



early distinction of 148 



Shara Murun formation, nature and fauna of 910-911 



Sheep Mountain, S. Dak., plate showing 140 



Shipley, Arthur E., quoted... 865 



Sinclair, William J., acknowledgments to xxn, xxra 



Size and proportions of Eocene titanotheres 584-585 



Skeleton, evolution of, general conclusions on. 780,782-783 



terms used in describing 588-590,822-823 



Skulls, adaptation in proportions of 29-32 



breadth of 257-262 



differential evolution in 788 



disharmonic evolution in length and breadth of 783-784 



evolution of, in coadaptation with the teeth and horns 784-785,786 



measurement of 256 



proportions of, in man, terminology of 260-261 



types of, in Eocene titanotheres 264 



Smith, Elliot, quoted 844-845 



South Dakota, in titanotherium time 106-109 



slow sedimentation in 109 



Specialization, influence of, on extinction 883 



Species, relation of, to mutations 819 



wrongly referred to the titanotheres, original descriptions of 246-247 



zoologic, comparison with paleontologic species... 18-19 



Spencer, Baldwin, cited 867 



Sphenocoelus Osborn, description of 417-418 



original description of 174 



uintensis Osborn, description of 419 



original description of _ 175-167 



