808 



INDEX. 



Labyrinthodonts, last of, 484. 



range of, in time, 388,* 589.* 

 Laccopteris falcata, 409. 



germinans, 409. 

 Lacertians, 33S,§ 443, 484. 



range of, in time, 388.* 

 Lacertilians, 510. 

 Lacustrine group, 513. 

 Laekenian group, 513. 

 Laelaps, 464. § 

 Lagomys, 520. § 



spelaeus, 564. 

 Lagrange group, 493. 

 Lake-basins, formation of, 539, 



762. 

 Lake-border formations, 544. 

 Lake Champlain outlined, 215. 



an arm of the sea in the 

 Quaternary, 552. 



terraces on, 550. 

 Lake of Geneva, color of, 685. § 

 Lake Memphremagog, corals at, 



225. 

 Lake, Salt. See Great Salt 



Lake. 

 Lake Superior Archaean, 150, 

 159. 



copper, 184, 185. 



Chazy, 183. 



trap, 185. 



sandstone, 376. 



silver, 186. 

 Lake-dwellings, 576. 

 Lakes, positions of, 22. 



change of level in surface of, 

 634. 



bursting of, 636, 650. 



elevations of, 23. 



Tertiary, 491. 



the great, of N. America, i 

 origin of, 394. 



without outlets, usually salt, 

 23. . . 



Lama, 506, 568. 



Lamellibrauchs, 125,§ 253,§ 

 333, 342, 482. 



culmination of, 483. 



range of, in time, 387.* 

 Laminaria, ash of, 61, 611. 

 Laminarian zone, 611. 

 Laminated rocks, 63. § 



structure, 82.§ 



structure, cause of, 741. 



structure of glaciers, produc- 

 tion of, 683. 

 Lamination, oblique, of layers, 



82* 83, 671. 

 Lamna, 467, 475, 510. 



acuminata, 477. 



elegans, 262* 501* 509, 518, 

 519. • 

 Landenian group, 512. 

 Land affects climate, 755. 



arrangement of, 10, 13. 



below sea-level, 13, 14. 



first, above water, 160. 



mean height of, 14. 

 Land-plants. See Plants. 

 Landscape-marble, 425. 

 Land-snails, first of, in Carbo- 

 niferous, 332, 342. 

 Land-slides, 655. 

 Laornis, 468. 



Lapland, Primordial in, 179. 

 Laramie Mts., Archaean in, 150. 



Jurassic in, 431. 

 See Missouri, Upper. 

 Larfcet, E., on Amiens gravel, 

 576. 



Lartet, E., on migrations, 572. 

 Larve, 592. 

 Laurel, 594, 609. 

 Laurentian Period, 151. 

 Laurophyllum reticulatum, 460 

 Laurus, 497, 498, 514. 



obovata, 498. 



pedata, 498. 

 Lauzon group, 184. 

 Lava, 49, 79,§ 702,§ 707, § 715. 

 Lava-cones, 704.* 

 Layer, 81. § 



Layers, structure of, 82. § 

 Leader, 114.§ 



Lead-mines in Illinois and Wis- 

 consin, 197. 



in Missouri, 186. 



in New York, 222. 



in the Oneida, 222. 



iu the Trenton, 207. 

 Leaf-beds, 512. 

 Leaia triearinata, 342. 

 Lebanon limestone, 163. 

 Lebanon Mt., fishes of, 520. 

 Lecanocrinus elegans, 199,* 203. 

 Leclaire limestone, 221. 

 Le(Jonte,J. L., on fossil Ephem- 

 era, 416. 

 LeCoute, J . , analysis of coal, 493. 



on mountain making, 749. 

 Leda, 385. 



amygdaloides, 518. 



minuta, 551. 



multilineata, 509. 



pernula, 551. 

 Leda clays , 550, 555. 

 Leech, 122. § 

 Leguminosites Marcouanus, 



459.* 

 Leidy, J., Bathygnathus, 417. 



publications of, 468. 



Tertiary Mammals, 506, 507. 

 Leiodon, 475. 



dyspelor, 468. 



proriger, 468. 

 Lemming, 571. 

 Lemurs, 506, 510. 

 Length of time, 590. 

 Lenticular iron-ore, 220. 

 Leopard, 564. 

 Leperditia, 180. 



alta, 239,* 240. 



amygdalina, 192. 



Anna, 188,* 189. 



Baltica, 230, 249. 



Canadensis, 192. 



concinnula, 190- 



cvlindrica, 228. 



Fabulites, 202,*, 204. 



Josephiana, 204. 



Solvensis, 180. 



Trojensis, 178. 



Lepidodend'rids, 269, § 324, 325, 



328, 351, 354, 356, 359, 362, 



407. 

 a comprehensive type, 382. 

 Lepidodeudron, 245, § 280, 296, 



297, 307, 323,* 329, 331, 



348, 349, 356. 

 aculeatum, 297, 324,* 329. 

 Chemungense, 278. 

 clypeatum, 324* 329. 

 corrugatum, 297. 

 costatum, 297. 

 diplotegioides, 297- 

 forulatum, 297- 

 Gaspianum, 271, 278. 

 obscurum, 297. 



Lepidodendron prunaevum, 

 269* 271. 

 Serlii, 349. 



Sternbergii, 297, 329. 

 tetragonum, 297. 

 turbinatum, 297. 

 Veltheimianum,283, 297. 

 Worthianum , 297. 

 Lepidomelane, 54. § 

 Lepidophloios, 348. 

 Lepidophyllum, 348. 

 Lepidostrobus, 297, 329, 348. 

 Lepidopteris Stuttgartensis, 



407,* 409. 

 Lepidosteus, 61, 264,§* 519. 

 glaber, 510. 

 osseus, 264.* 

 Whitneyi, 510. 

 Lepidotus, 475, 508. 



Fittoni, 450. 

 Leptacanthus, 275, 304. 

 Leptsena, 172,§* 189, 190, 199, 

 2*>8, 249, 252, 437, 448, 

 597. 

 depressa, 203* 248. 

 incrassata, 190. 

 Moorei, 438,* 448. 

 plicifera, 191.* 

 rugosa, 200.* 

 sericea, 200* 203, 205, 206, 



207, 208, 209, 228. 

 transversalis, 208, 226,* 229, 



248. 

 last of, 437. 



range of, in time, 386.* 

 Leptarctus, 511. 



primus, 511 

 Leptauchenia, 511. 

 Leptochoerus, 511. 

 Leptocoelia, 171. 

 concava, 243. 

 disparilis, 226,* 229. 

 flabellites, 243. 

 Leptophleum rhombieum, 278. 

 Leptosolen Conradi, 468. 

 Leptynyte, 68. § 

 Lepus, 519,§ 520. 

 Lescuropteris, 348. 

 Lesley, J. P., sections by, of 

 Coal-measures in Pa., 311, 

 320, 396* 

 axes of flexure in Pennsyl- 

 vania, 397-* 

 Coal and its Topography, 320. 

 Coal-measure iron-ores, 318. 

 fault at Chambersburg, Pa., 



399. 

 faults in southwestern Vir- 

 ginia, 399,* 400. 

 topographical effects of ero- 

 sion, 645. 

 Lesquereux, L., coal-plants, 

 331, 356. 

 equivalency of coal-beds. 321. 

 Li^nitic of Rocky Mts., 457, 



458, 493. 

 Lignitic flora, 497, 498. 

 table of coal-plants, 331, 348. 

 Tertiary plants and fruits, 

 493, 494. 

 Lestosaurus simus, 465,* 468. 

 Leucite, 56. § 

 Leucitophyre, 78. § 

 Levant series, 375. 

 Level, changes of, in the bot- 

 tom of the ocean, vary the 

 water-line along the con- 

 tinents, 761. 

 origin of changes of, 761. 



