INDEX. 



785 



Labrador current, 41, 651, 658. 

 Labradorite, 56.$ 

 Labyrinthine structure of 



Ganoid teeth, 280 * 

 Labyrinthodonts, 345.$ 395. 

 a comprehensive type, 597. 

 culmination of, 497. 

 range of. in time, 492, 572. 

 Labyrinthodon giganteus, 



436,* 438. 

 Laccopteris falcatus, 420. 



germinans. 420. 

 Lacertians, 346.$ 



culmination of, 498. 

 range of, in time, 402. 

 Laekenian group, 523. 

 Lagomys, 529.$ 

 Lagrange group, 509. 

 Lakes, positions of, 23. 



change of level in surface 



of, 632. 

 fresh-water, of Tertiary, 

 over TJ. Missouri region, 

 531. 

 the great of N. America, 



origin of, 199. 

 without outlets, usually 

 salt, 23. 

 Lake Champlain outlined. 229. 

 Champlain an arm r f the 

 sea in the Post-tertiary. 

 549, 552. 

 Superior Azoic, 137. 

 Superior copper, 177, 195. 

 Superior Potsdam beds, 



174, 199. 

 Superior Primordial trap, 



195, 199. 

 Superior sandstone, 380. 

 Lake-habitations, Swiss, 582. 

 Lamantin, 423.$ 

 Lamellibranchiates, 157.§ 

 Laminated structure, 93.? 

 structure, cause of, 727. 

 structure of glaciers, pro- 

 duction of, 674. 

 Lamination, oblique, of layers, 



665. 

 Lamna, 477. 



acuminata, 487. 

 elegans, 277,* 517. 

 Land, arrangement of, 10, 13. 



mean height of, 15. 

 Land-plants. See Plants. 

 Land-snails, first of, in Carbo- 

 niferous, 346, 347. 

 Land-slides, 649. 

 Laramie Mts., dip of strata 

 near, 532. 

 See Missouri, Upper. 

 Laurentian, 142. 

 Lava, 89.g 6S5.§ 690.$ 

 Layer. 91.$ 



Lead-mines in Illinois and 

 Wisconsin. 207. 

 in Missouri. 177. 

 in the Oneida, 230. 

 in the Trenton. 207. 

 Lebanon, Mt., fishes of, 529. 

 Lecanocrinus elegans. 212.* 

 Leclaire limestone, 246. 

 Leda, 399. 



multilineata, 517. 



Leda Portlandica, 552. 

 Leda clays, 552. 

 Legnminosites Marcouanus, 



471.* 

 Leidy, mammals of the Upper 

 Missouri, 515, 519, 522. 

 Leperditia alta, 255.* 

 Anna, 193. 

 Baltica, 242, 262. 

 Canadensis, var. nana, 



211* 

 cylindrica, 233. 

 Fabulites, 215.* 

 Josephiana, 215. 

 Lepidodendrids, 395.$ 

 Lepidodendron, 334.$ 356, 363. 

 Chemungensis, 750. 

 clypeatum, 335.* 

 Gaspianum, 283. 

 obovatum, 335.* 

 primajvum, 282.* 

 Sternbergi, 334. 

 Vanuxemi, 290.* 

 Veltheimianum, 342. 

 Worthianum, 342. 

 Lepidoganoids, 279.$ 

 Lepidoids, 2S0.$ 

 Lepidolite, 57.$ 

 Lepidophloios, 356. 

 Lepidophyllum, 356. 

 Lepidostrobus, 335,$ 356. 

 Lepidopters, 420.$ 

 Lepidosteus, 67, 280.$* 



osseus, 279.* 

 Lepidotus, 517. 

 Leptgena, 184.$* 

 depressa, 261. 

 incrassata, 210. 

 Moorei, 453,* 464. 

 plicifera, 210.* 

 sericea, 213,* 216, 220, 224, 



237. 

 transversalis, 240,* 261. 

 last of, 450, 495. 

 range of, in time, 495. 

 Leptarctus, U. Missouri, 519.$ 

 Leptauchenia, U. Missouri, 



519.$ 

 Leptochoerus, U. Missouri,521. 

 Leptocoelia disparilis, 240* 

 Leptynite, 76.$ 

 Lepus, 529.$ 



Lesley, J. P., sections by, of 

 Coal measures in Pa., 

 331, 332. 

 map of axes of flexure in 



Pennsylvania, 406. 

 on fault at Chambers- 

 burg, Pa., 408. 

 on topographical effects 



of erosion, 680. 

 on faults in southwestern 



Virginia, 720. 

 on Glacier-scratches in 



Pennsylvania, 751. 

 work by, on Coal and its 

 Topography, 330. 

 Lesquereux on equivalency 

 of coal beds, 332. 

 table of coal plants, 355. 

 on Tertiarv plants and 

 fruits, 513, 514. 

 Leucite, 57.$ 



51 



Leucitophyr, 89.$ 

 Levant series, 379. 

 Level, changes of, in the bot- 

 tom of the ocean, vary 

 the water-line along the 

 continents, 723. 



origin of changes of, 716. 



oscillations of, in the Post- 

 tertiary, 569. 



recent changes of, 586. 



See, further, Elevations 

 and Height. 

 Lias, 44S.$ 

 Liassic epoch, 447. 

 Libellula, 420,$ 461* 

 Lichas Boltoni, 241.* 



Trentonensis, 215.* 

 Lichens, 165.$ 



Life, earliest species, rank of, 

 396. 



earliest species are water- 

 species, 395. 



extinction of species of, 

 601. 



kinds of, most likely to be- 

 come fossilized, 609,610. 



lowest kinds of, the best 

 rock-makers, 611. 



materials of rocks from,66. 



number of existing spe- 

 cies, 575. 



number of species of, in 

 L. Silurian, 225, 226. 



origination of species of, 

 601. 



products contributed by, 

 to rock-formations, 608. 



system of progress of, in 

 the course of geological 

 time, 592. 



relation of progress in, to 

 the physical history of 

 the globe, 600. 



protective effects of, 604. 



transportation of seeds, 

 vermin, &c, by, and 

 destructive effects of, 

 605. 

 Life, oceanic, distribution of, 

 illustrated by the Phy- 

 siographic Chart, 44. 



systemless, 596, 597. 

 Life, in Carboniferous, 343. 



characteristic of the Ce- 

 nozoic, 571. 



in Cretaceous, 470, 4S1, 

 492. 



in Hudson period. 219. 



in Jurassic, 449, 466. 



in Lower Helderberg, 253. 



in the Mesozoic, 493. 



in Niagara period, 239. 



in the Palasozoic, 394. 



in Permian, 373. 



in Potsdam period. 202. 



in Post-tertiary, 558. 



in Post-tertiary of Aus- 

 tralia, 566. 



in Tertiary, 512. 



in Trenton period, 208. 



in Trenton and Hudson 

 periods, 225. 



in Triassic, 418, 420. 



