INDEX. 



799 



Cyrena cuueiformis, 518. 



intermedia, 501. 



pulchra, 519. 



semistriata, 513, 519. 



shale, 513. 



tellinella, 518. 

 Cyrtia, 171, § 429. 

 Cyrtina, 171. 



rostrata, 256. 



umbonata, 274. 

 Cyrtoceras, 228, 229, 429. 



annulatum, 201 * 203. 



inaequiseptum, 208. 



multicameratum, 208. 



sacculum, 274. 



unci u latum, 261. 

 Cyrtodonta, 203, 243. 



Hindi, 205. 

 Cyrtolites, 203. 



compressus, 201 * 203. 



imbricatus, 206. 



ornatus, 206. 



Trentonensis, 201 * 203. 

 Cystideans, or Cystids, 129,§ 

 382. § 



a comprehensive type, 382. 



last of, 288. 



number of, in L. Silurian, 

 203. 



range of. in time, 385, 386. 

 Cystiphyllum, 230. 



Siluriense, 245, 246 * 247. 

 Cythere, 304. 



Americana, 120.* 

 Cytherea, 475. 



Say ana, 495. 



Dachstein beds, 425, 429. 

 Dacite, 78. § 

 Dadoxylon, 349, 371. 



Brandlingi, 331. 



Ouangondianum, 271. 

 Dakota, Archaean in, 150. 



Cretaceous in. 456. 



Jurassic in, 431. 



Triassic in, 406 

 Dakota group, 456. 

 Dalmanites, 174,§ 204, 228, 229, 

 249, 253, 285. 



Boothii,274. 



calliteles, 273,* 274. 



Hausmanni, 174,* 240. 



limulurus, 227,* 229. 



nasuta, 248. 



pleuroptyx, 238, 240, 243 



selenurus, 261. 

 Dauiour, A. on composition of 



Millepores, 60. 

 Damourite, 54.§ 

 Danian group, 470. 

 Dan River coal-field, 406. 

 Dapedius politus, 449. 

 Darien, Isthmus of, 659, 756. 

 Dartmouth group, 282. 

 Darwin, C, on Atlantic dust- 

 shower, 634. 



on coral islands, 625. 

 Dasyceps Bucklandi, 372. 

 Dasypus group, 570. 

 Data of geology, 4§ 

 Datolite, 734. 



Daubree, formation of silicates 

 by means of superheated 

 steam, 727. 



on chrysolite. 736. 

 Davidson, T., on Brachiopods 



169. 

 Davidsonia, 173.§ 

 Davis, effect? of tidal action, 668. 



Dawsonella Meeki, 333*, 342. 

 Dawson , J . W. , Annelids in Ar- 

 chaean, 159. 



carbon in Archaean, 157. 



Devonian life, 274. 



Eozoic time, 148. 



Eozoon, 158. 



fossil wood, 258,270, 331. 



iron-ores in Nova Scotia, 74. 



Joggins section, 319, 



land-snails, Carboniferous, 

 341, 358. 



metamorphic Devonian, 289. 



origin of coal, 362. 



Quaternary mollusks, 551. 



Rhizopods, 189. 



spores in coal, 318. 



Xylobius, 350. 

 Day, 768. 

 Dead Sea, 14. 



Deane, on tracks of Insects, 416. 

 Death's Valley, 15. 

 Debituminization, 400, 725. 

 Decapods, 122,§ 335. 



range of, in time, 388.* 

 Decomposition of wood, 362. 



of rocks, 688. 

 Deep River coal-field, 408. 

 Deep-sea Coral zone 611. 

 Deer, 506, 507, 508, 518, 520, 



564, 568, 577. 

 Delaware, Cretaceous in, 455. 

 Delaware River, in the Creta- 

 ceous, 478. 

 Delesse, on contraction in rocks, 

 702. 



on moisture in rocks, 656. 

 Delphinus, 520. 



Conradi, 511. 

 Delta formations, 651, 670 



of the Indus, recent changes 

 of level in, 585. 

 Delthyris shaly limestone, 164, 



237. 

 Delthyris. See Spirifer. 

 Deltidium, 170. § 

 Deltodus, 304. 

 Dendrerpeton Acadianum, 343. 



Oweni, 343. 

 Dendrocrinus 204. 

 Dendrodus, 286. 

 Dendrograptus Hallianus, 177. 

 Dendrophyllia, 117* 619. 

 Denmark, Cretaceous iD, 470. 



human remains in 576. 



Quaternary in, 532. 

 Dentalina pulchra, 466. 

 Dentalium, 385. 



Meekianum, 342. 



Mississippiense, 499,* 509. 



obsoletum , 333.* 342. 

 Denudation complicating out- 

 crops, 96. § 

 Deoxydation , 696. 

 Depth of growing corals, 617. 



of species, zones in, 611. 



See Ocean. 

 Descent of rivers, 636. 

 Deserts, distribution of, 45. 



sands of, 631. 

 Desmids, 135 § 



in hornstone or flint, 257, 302, 

 471. 

 Desor, E., on Niagara retroces- 

 sion. 590. 

 Destruction of life. See Exter- 

 minations. 

 Determination of age of strata, 

 102.§ 



Detritus, 66,§ 648. § 



along sea-shores, 667, 668. 



of rivers, 648. § 

 Development, law of, in the 



earth's history, 756. 

 Devonian Age, 139, 254. 



and Carboniferous plainly 

 separated, 281. 



and Carboniferous uncon- 

 formable, 289. 



and Silurian united by the 

 Ludlow beds, 244. 



foreign, 282. 



in New England, 237, 256. 



life of, 288. 



thickness of rocks of, 373, 

 381. 



wanting in Dakota, 232. 

 Diabase, 78,§ 736. 

 Diabasyte, 70, § 78. 

 Diadema, 466, 474. 



Bennettiae, 476. 



seriale, 437*. 448. 

 Diallage rock, 73. § 

 Diatoms, 59, 60, 135,§ 496,* 611, 

 617, 632.* 



in flint, 257,* 471. 



of Virginia Tertiary, 496.* 

 Dibranchs, 124.§ 439, 483. 

 Dicellocephalus, 168, 174,5 178. 

 188, 190, 192. 



Minnesotensis, 177,* 178. 

 Diceras arietinum, 438,* 449. 

 Dichobune, 519. 



cervinum, 519. 

 Dichocriuus, 303. 

 Dichodon. 519. 



cuspidatus, 519. 

 Dichotomizing ribs on Brachio- 

 pods, 243. 

 Dick, analysis of coal, 316. 

 Dicotyledons, 134, § 609. 



range of, in time, 140.* 

 Dicotyles, 511, 565. 



antiquus, 511. 



Hesperius, 511. 



pristinus, 511. 

 Dictyocha crux, 496.* 

 Dictyoneura anthracophila, 

 350,* 351. 



Humboldtiana, 351. 



libelluloides, 351. 

 Dietyopteris, 348. 

 Didymograptus geminus, 192. 



h'irundo, 192. 

 Difficulties in determining age 



of rocks, 101. § 

 Dikes, formation of, 716. 



structure of, 109,§ lll.§* 



of Connecticut valley, origin 

 of, 716. 

 Diluvian epoch, 543. 

 Dimorphodon macronyx, 449. 

 Dimyaries, 126 § 



range of, in time, 387.* 

 Dinicthys Hertzeri, 274, 275. 

 Dinictis, 511. 

 Dinoceras, 494, 504,5* 510- 



mirabile, 504 * 510. 

 Dinophis grandis, 509. 



Halidanus 509. 



littoralis, 509. 

 Dinornis, 580. § 



giganteus, 580. 

 Dinosaurs, 338,§ 413. § 443,444, 

 450, 457, 464, 484, 501, 509, 

 592. 



last of, 484. 



range of, in time, 589.* 



