951 



Page 



Menodus giganteus Pomel, description of Pis. XVIII, XX, 



XXIV, XLVII, XLIX, CXXXIII, CXXXV-CXLI, 530-535 



giganteus Pomel, discovery and naming of 1 



original description of 204r-205 



skeleton of 6S7-689 



heloceras (Cope), description of Pis. XLVII, CXXIII, CXXIV, 524-525 



heloceras? (Cope), bones of 681-683 



mongoliensis Osborn, description of 93S 



monophylum, description of 618-522 



montanus (IVIarsh), description of 537-538 



peltoceras Cope, original description of 229-230 



platyceras Scott and Osborn, original description of 221-223 



proutii (Leidy) description of Pis. LXXXII, CXXV, CXXVI, 526-528 



selwynianus Cope, original description of 225-226 



syceras Cope, original description of 226-227 



tichoceras Scott and Osborn, original description of 219-220 



torvus (Cope), description of ._ _ Pis. CXXV, 



CXXVII, CXXXn- CLVIII, CLIX, 525-526 



trigonoceras (Cope), description of __ Pis. XX, 



XXII, CXXVIII-CXXXn, CXXXIV, CXXXV, CLVII, 528-530 



skeleton of 683-685,687 



varians (IVIarsh), description of -_ PI. CXLII, 535-537 



Menodus? rumelicus Toula, description of 941 



rumelicus Toula, original description of 2.'!0-231 



Menops Marsli, original description of 223 



varians Marsh, original description of 223 



Mesatirhinus Osborn, derivation of 831-832 



description of Pis. XVII, L, LXXI, LXXII, 387-388 



original description of 182 



skeleton of .599-612,636-641 



Junius (Leidy), description of 388 



megarhinus(Earle), description of PI. LXXII, 388-389 



petersoni Osborn, description of Pis. L, LXXI, LXXII, 389-395 



original description of 182 



petersoni?, skeleton of 641-643 



(=Dolichorhinus) superior Riggs, description of 395 



original description of 190 



sp., description of 395 



Mesatirhinus?, bones of 643-644 



Metarhinus Osborn, derivation of 832 



description of Pis. LII, LXXI, LXXIV, LXXVIU-LXXX, 420-421,940 



original description of 183 



cristatus Higgs, description of Pis. LXXVIII, LXXIX, 429 



original description of 191 



earlei Osborn, description of Pis. LXXVIIX-LXXX, 426-428 



original description of 183-184 



fluviatilis Osborn, description of Pis. LII, LXXI, LXXIV, 421-426 



original description of 183 



riparius Riggs, description of Pis. LXXVIII, LXXIX, 429 



original description of 191 



Metarhinus? mongoliensis Osborn, description of 940-941 



Metarhinus? sp., description of 429 



Metarhinus?, bones of 644-645 



MiUer, Gerrit S., quoted 844 



Miobasileus Cope, original description of 210-211 



optiryas Cope, original description of 211 



Modes and causes, distinction between 805-806 



Mongolia, discoveries of titanotheres in 913-916 



eiplorations in 899-900 



generic and specific characters of titanotheres from 916-918 



mammals collected in 900-901,907 



Tertiary formations of 901-913 



Monophyletic interpretation of 1896 148 



Morris, Charles, quoted 878 



Mountain-basin region. Eocene history revealed in 6-8 



1 deposition in _ 54-56 



bic history of 51-53 



Muscles, of the face and jaw. form and attachments of 703-705 



of the fore limb, form and attachments of 714-717 



of the hind limb, form and attachments of 717-722,724 



of the neck and back, form and attachments of 709,712-713 



Muscular action, mechanical principles of 727-731 



Museums, cooperation of xxni 



Mutations of Waagen, ascending, nature of 252 



contrast of, with rectigradations of Osborn 818-819 



relation to species 819 



N 



Names of titanotheres, five rules for determining 153-154 



Natural selection, conclusions regarding 887-888 



Darwin and Wallace on 855-856 



influence of 807-808 



Neck, muscles of __ 709,712-713 



101959— 29— VOL 2 40 



Neotoma, evolution of skull of 347 



Neotype, definition of 153 



Neumayr, M., quoted ggs 



Nile River, flood-plain deposition in _ _ 112 



Nomenclature, zoologic, compared with paleontologic 20-22 



Ojo Alamo, N. Mes., plate showing. -, 140 



Oligocene flood-plain sedimentation, progress of, in various areas 103-112 



Oligocene, lower, mammals, American and European forms 101 



lower, titanotheres, age characters of 456^57 



titanotheres, auditory meatus of 44s 



brontotheriine group of, character of skull and teeth 457-464 



chronologic list of genera and species of __ 201-202 



division of, into four phyla 245-246 



environment and geologic succession of 443-444 



evolution of skull of, with relation to skull of Eocene titan- 

 otheres.. ._. 786-787 



genera accepted as valid 469-470 



genetic relations of, to Eocene titanotheres 467, 468-469 



horns of ._.._. 444-445 



localities at which collections have been obtained 110-111 



menodontine group of, character of skuU and teeth 457-464 



muscles of the limbs of 725 



nasals of 446 



occiput of. 446-448 



original descriptions of 201-242 



sexual characters of, common to all phyla 448 



skeleton of . 662-697 



skull, development of 451-453 



stratigraphic distribution ofspecies of, in the Chadron formation. 113-115 



subfamilies of, characters and relations of... 465-468 



reclassification of 246 



teeth of _ 448-457 



zygomatic arches of ^ 446 



titanotherium zone, fish, reptile, and mammal fauna of 117-121 



Ontogeny, influence of, on racial evolution 807-808 



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



Organs, dominant, influence of, on selection and extinction. 883-884 



Original descriptions of genera and species 157-242 



Os inaominatum, length of 746 



Osborn, Henry Fairfield, work by xix, xxn 



Overevolution, effects of 28 



Owen, David Dale, description cf the Mauvaises Terres by.. 141-143 



Owen, Richard, quoted 878 



Palaeosyopinae Earle, proposed as subfamily name 245 



Palaeosyopinae (Steinmann and Doderlein), description of 298 



proposed as subfamily name 245 



species of, in the upper Huerfano 297 



Palaeosyopine group, double parallelism in, with the Manteoceras-Dolicho- 



rhinus group _ 598 



genera of, compared 297-298 



Palaeosyops Leidy, description of Pis. XVI, 



XXVII, XXVIII, XLIV, L, LIII, LV, LVI, LVIII-LXII, 312-315 



evolution of proportions of 315-316 



muscles of 714-724 



origin of name . 149 



original description of., 157 



progressive distinctions from Limnohyops 302-303 



proportional evolution of skull of . 823-827 



retardation of horns in 790-791 



skeleton of 599-612,619-620 



borealis Cope, original description of 168 



copei Osborn, description of PI. LX, 336-337 



original description of 181-182 



skeleton of 629-630 



copei?, bones of 631 



diaconus Cope, original description of 165-166 



fontinalis (Cope), description of 317-319 



grangeri Osborn, description of ..Pis. LIX, LXII, 335-336 



original description of 181 



humilis Leidy, original description of 159 



hyognathus Osborn, original description of 169-170 



Junius Leidy, original description of 159-160 



laticeps Marsh, original description of 160 



leidyi Osborn, description of Pis. XVI, 



XXVII, XLIV, L, LIII, LVI, LIX-LXn, 323-331 



original description of 181 



skeleton of 620-626 



longirostris Earle, description of PI. LVI, 319 



original description of '. . '. 172-173 



