950 



Lambdotherium, size of - - - ™0 



brovmianum Cope, original description of - 169 



magnum Osboi'n, description of --- -- 288 



original description of --- - 19" 



popoagicum Cope, description of- -- -- PI- LIV, 281-283 



original description of --- 169 



slieletonof-.- -- 590-591 



primaevum Loomis, description of. --- PI. LIV,283-286 



original description of --- --- 178-179 



priscum Osborn, description of --- - 286 



original description of -- 194 



progressum Osborn, description of. --- --- 286-288 



original description of --- -- 194-195 



Lambe, Lawrence M., Canadian species described by 235-240 



work of- - - -- 1*9 



Lance flora, climate during life oL --- -- 45,47 



Lane, Bernard H., acknowledgment to - - -- xxra 



Lartet, Edouai-d, cited --- - - 881 



Lectotype, definition of- -- 153 



Leidy, Joseph, fossils described by 143-144 



titanotberes named by -- --- xix 



work of- - XXI, XXIII, 149-150 



Leidyotherium Prout, original description of 208 



Lemuroids, appearance of --- --- 68 



Leurocephalus Osborn, Scott, and Spier, original description oL -- 167-168 



cultridens Osborn, Scott, and Speir, original description of 168 



Levels, stratigraphic, sources of error in determining _ --- 116-117 



stratigrapbic, specimens from different ones must be kept separate 154 



Life phases, four, during Eocene and early Ollgocene time 12-13 



Life zone 1, fauna of - 63-64 



2, fauna of --- -- 63-64 



3, fauna oL - --- 64 



4, fauna of - - 64 



5, fauna of - 64-65 



6, fauna oL --- 68-69 



7, fauna of - - 69 



8, fauna of. - 69 



9, fauna of 69-73 



10, fauna of 82 



11, fauna of— '--- - - --- 84 



12, fauna of- 84-85 



13, fauna oL - — 89-91 



14, fauna of- 89-91 



15, fauna of --- ---- 94-96 



16, theoretic features of --- 99 



17, fauna of. -- 101-103 



Life zones, characteristic m amm als of 57-58 



correlation of, with physiograpbic epochs from basal Eocene to early Oli- 



gocene time 8-10 



seventeen distinguished 56-57 



relation of, to sedimentary divisions , 2-4 



Limb segments, proportions of, in cursorial and graviportal ungulates 733-747 



Limbs, adaptation of, to locomotion in fleet and ponderous types 727-747 



of hoofed animals, adaptive types of structure o£ -- 586-588 



evolution of 583-584 



of titanotberes, evolution of 33-34,754-765 



ratios of, showing evolution from primitive to graviportal and cursorial 



types- _ 735-739 



straightening of, in adaptation to great weight 731-732 



Limnohyidae Marsh, proposed as family name 241 



Limnohyops Marsh, character of skeleton of 599-612,614 



description of. Pis. LVI, LVII, LX, LXU, 303-304 



evolution of proportions of 304-305 



original description of... 170 



progressive distinctions from Palaeosyops 302-303 



fontinalis Cope, original description of 165 



laevidens (Cope), description of PI. LVII, 305-306 



original description of 163-165 



laticeps Marsh, description of Pis. LVII, LXII, 311-312 



skeleton of 618-619 



matthewi Osborn, description of— 308-309 



original description of 180 



monoconus Osborn, description of PI. LXII, 309-310 



original description of 180-181 



monoconus, character of skeleton of 614,616-618 



prisons Osborn, description of Pis. LVI, LX, LXII, 306-307 



original description of 180 



robustus Marsh, original description of 161-162 



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



separation of, from that of Palaeosyops 298-301 



Limnohyus Leidy (not Marsh), original description of 162 



Limnohyus Marsh, original description of 161 



Localities at which Ollgocene titanotberes have been collected 110-111 



Locomotion, adaptation of limbs to, in fleet and ponderous types 727-747 



adaptation of skeleton for _ _ _ 798 



research on__ ___ _ 727 



Loh formation, nature and fauna of 905 



Loomis, F. B., quoted.. _ 884 



Lophiodontidae, proportions of limbs of 747 



Lophodont families of perissodactyls, descent of 779-780 



"Lost Cabin" locality, east of Lost Cabin, Wyo., plate showing 140 



Lyell, Charles, on the balance of nature 858-859 



quoted 857-858,858-859,869-870,875 



Lyons, H. Q., quoted 112 



"Lysite" locality, north of Lost Cabin, Wyo., plate showing 140 



Lull, Richard S., acknowledgment to xxin 



quoted 675-678 



species described by 234-235 



work of. 149 



M 



Magnum, development of 800-801 



Mammals, influence of, on the extinction of other mammals 874-877 



Manteoceras Hatcher, derivation of 830 



description of- Pis. XVI, 



X VIL XXIX, XLVI, LI, LIII, LV, LXIII, LXVII, 358-362, 362-364, 939-940 



original description of 177 



skeleton of 599-612,631 



manteoceras Hay, description of Pis. XVI, 



XVII, XXIX, XLVI, LI, LIII, LV, LXIII, LXVII, 362-363,365-371 



original description of 178 



skeleton of 631-636 



uintensis Douglass, description of PI. LXIII, 363, 372-373 



original description of 186-187 



uintensis?, description of. 373-374 



washakiensis Osborn, description of PI. LXVII, 363, 371-372 



original description of 182 



Manteoceras? irdinensis Osborn, description of 939-940 



Manteoceras-Dolichorhinus group, double parallelism in, with the palaeosyo- 



pine group 598 



stages, series, and subfamilies of 357-358 



successors to 434-442 



Manteoceratinae Osborn, description of 358 



Manus, progressive stages of 800 



Marsh, Othniel C, collection and description by 144-145 



quoted. _ 881,882 



work of XIX, xxi-xxn, XXIII, 145-146,150 



Matthew, Christine D., acknowledgment to xxiii 



Matthew, William Diller, quoted 841 



work of xxn 



Mauvaises Terres. See Badlands. 



Meek, F. B., and Hayden, F. V., specimens collected by 144 



Megaceratops Cope, proposal of name 211 



acer Cope, original description of 211 



heloceras Cope, original description of. 212 



Megaceropinae, character and relations of 465-468 



description of 640-541 



Megacerops Leidy, description of. Pis. XVIII, CXLIH-CLX, CLXXXVI, 541-543 



original description of 208 



reference of early specimen to 144 



acer Cope, description of... Pis. XVIII, CXLVI-CLII, CLVH, 545-548 



assiniboinensis Lambe, description of 549 



original description of 238-240 



bicornutus Osborn, original description of 231,233 



brachycephalus Osborn, original description of 231 



bucco (Cope), description of Pis. CXLIV, CXLV, CLIII-CLVL 544-545 



coloradensis Leidy, description of 544 



original description of.. 208-209 



copei (Osborn), description of Pis. CXLIII-CXLV,548,549 



marsbi Osborn, original description of... 233-234 



primitivus Lambe, original description of 235,238 



riggsi (Osborn), description of Pis. CLVIII-CLX, 550 



original description of 242 



syceras (Cope), description of 549 



tyleri Lull, original description of 234-235 



Mendel, work of, on the origin of variations 841-842 



Menodontidae Cope, proposed as family name 244 



Menodontinae, character and relations of 465-'168 



description of 505 



skeleton of 663,678-689 



Menodus Pomel, derivation of 831 



description of Pis. XVIILXX, XXII, XXIV, XLVII, 



XLIX, LXXXII, CXXIII-CXLII, CLVII-CLIX, 522, 524, 938 



original description of 204 



angustigenis Cope, original description of. 219 



dolichoceras Scott and Osborn, original description of 220-221 



