INDEX 



Abbreviations used in illustrations of skulls 262-263 



Abel, Othenio, quoted — 886 



Acknowledgments for aid xix, xxii-xxm 



Allen, Joel A., quoted 872 



AUometrons, causes of evolution ot 843 



correlation of -- 834 



deflnitionof. -.. - 252,812 



germinal, influence of environment on 844-845 



origin of, from gradual change 843-844 



from sudden change 844 



survival selection value of 



ontogenetic, influence of change of habit or environment on 



origin and development of 820-822,834-835 



resemblances to and differences from rectigradations 813-814 



reversed evolution of.-. 833 



separability of, in heredity.. 833-834 



AUometry, studies on 828,830 



Allops Marsh, bones of 678 



derivation of 831 



description of Pis. XX, 



XXI, XXXVIII, XC, CXI-CXXII, CXXXII, 506-509 



original description of - 224 



crassicornis Marsh, description of Pis. CXIX-CXXII, 617-518 



original description of _ 228 



skeleton of 679-681 



marshi (Osborn); description of Pis. XXXVni, CXn-CXVI, 511-515 



skeleton of 678-679 



serotinus Marsh, description of Pis. XCIII, 



cxvn-cxx, CXXXII, 515-517 



original description of 225 



walcotti Osborn, description of. Pis. XX, XXI, CXI, CXII, 609-511 



original description of 241-242 



American Museum ot Natural History, expeditions of 161, 152 



Amynodon, fore limb of, compared with that of Dolichorhinus 648-649 



Amynodontidae, proportions of limbs of 750-763 



Anderson, A. E., photographs made by xxm 



Andrews, C. W., quoted 879,899 



Anisacodon Marsh, original description of 217 



montanus Marsh, original description of... 217 



Antelopes, African, adaptive radiation of 125-127 



Appearance of primitive titanotheres 69 



Appetite, divergence caused by changes in 127 



Ardyn Obo formation, nature and fauna of _ 908-910 



Arshanto formation, features of 912-913 



Artiodactyla, appearance of 68-69 



extinction of 880 



Asia, origin of mammals in 899 



Astragalus, evolution of 802 



Atlas vertebra, foramina of. 797-798 



B 



Back, muscles of. 709,712-713 



Badlands, in Nebraska, description of, by David Dale Owen 141-143 



in South Dakota, plate showing 140 



south of White River, Utah, plate showing 140 



Balance of nature, Lyell, Darwin, and Wallace on 858-869 



Bateson, William, work of, on the saltation hypothesis 841 



Beaver Divide, Wye, early Eocene fauna and physiography on 274 



Eocene and lower Oligocene section at 99-101 



north face of, plate showing 140 



Beebe, WUliam, quoted 868 



, William E., drawings made by xxm 



r, F., drawings made by __ xxm 



Bibliographies. 42, 132-140,698-702,802-804,850-852,889-894,944-945 



Big Horn Basin, Wyo., early Eocene fauna and physiography in 274, 275-276 



Biocharacters, correlation of 834 



initiation of 809-810 



natiure and kinds of 808-809 



separability and coordination of 809 



study of. 805 



velocities of 810-811 



phyla distinguishable by 811-812 



Page 



Birds, influence of, on the extinction of animals 874 



Bockh, Johann, and Maty, Eocene titanothere discovered by 150 



original description of species by 166 



Bostwick, Thomas A., acknowledgment to xxm 



Brachycephaly, domination of shape of teeth and skull bones by... _. 257-269 



Brachydiastematherium Bockh and Maty, description of PI. LXX, 382 



original description of 166 



transylvanicum Bockh and Maty, description of 382-383,941 



original description of. 166-167 



Brain, evolution of 793-794 



size of, in relation to extinction 881-883 



Branching, pbyletic, of the titanotheres 780 



Breeding, rate of, in relation to extinction 879,884-885 



Bridger formation, duration of deposition of 81 



exploration of.. 79 



exposures of --- 81 



fauna of 79,80-81,82-86,86 



life environment during deposition ot 80-81 



nature of 78-79,83 



playa-lake deposits in 79-80 



volcanic ash in 79 



Brontopinae, character and relations of 465-468 



comparison of genera of 471-481 



level and features of 470-471 



skeleton of 664-678 



Brontopinae?, bones of 652,655 



Brontops, Marsh, derivation of- 831 



description of. Pis. XVIII, 



XX, XXI, XXIII, XXIV, XXXIII-XXXVI, XLIII, XLVII, 

 LXXXII-CIII, CLIII, CLX, CXCV-CCXXIX, 482-483, 936. 



original description of - 222 



brachycephalus (Osborn), description of. Pis. XXI, 



XXLII, LXXXin-LXXXVIII, 483-488 



brachycephalus?, skeleton of 676 



dispar Marsh, description of Pis. XXIV, 



XXXIII, LXXXVIII, XCIV, 488^92 



original description of 223 



skeleton of 664-666 



gobiensis Osborn, description of - 936-938 



robustus Marsh, description of Pis. XVIII, XX, XXXIII-XXXVI, 



XLIII, XLVII, XCV-CIII, CXCV-CCXXIX, 492-499. 



original description of 222-223 



validus Marsh, original description of '. 228 



Brontops phylum, features of. 473-481 



Brontotheridae (Brontotheriidae) Marsh, proposed as family name 243-244 



Brontotheriidae Marsh, description of 279 



Brontotheriinae, character and relations of 465-468 



description of- 550-555 



possible Eocene ancestors of 468-469 



Brontotheriine group, description of - 538-540 



Brontotherioidea Hay, origin of, as name for superfamily 243 



Brontotherium Marsh, description of- Pis. XVIII- 



XXII, XXXIX-XLII, XLVII, LXXXII, CXXIV, CXXXII, 

 CLVII, CLXI-CXCIV, CCXXX-CCXXXV, 666-557. 



Oligocene stages of 19-20 



original description of 209 



origin of name 146 



skeleton of ..- 690-694 



curtum (Marsh), description of Pis. XX, XLVII, CLVII, CLXXVII- 



CLXXX, CLXXXIU-CLXXXVI, CXC, CXCII-CXCIV, 674-677 



dolichoeeras (Scott and Osborn), description ot PI. CLXXXVI, 672-673 



giEas Marsh, description of Pis. XX, 



LXXXII, CXXXIII, CLXX, CLXXI, CLXXIII-CLXXV, 

 CLXXXIV, CXC, CCXXX-CCXXXV, 667-572. 



original description of 209 



hatcheri Osborn, description of - Pis. XIX, 



XXXIX-XLII, CXXIV, CLXVn-CLXX, CLXXII, 563-565 



original description of 235 



hypocoras (Cope), description of- Pis. CLXVI, 



CLXX, CLXXXIII, 662-663 



ingens Marsh, original description of 214-216 



leidyi Osborn, description of Pis. XIX-XXII, 



XLVII, CLXI-CLXV, 558-560 



original description of 234 



947 



