INDEX. 



815 



Onchus, 282. 



Deweyi, 229. 



tenuistriatus, 246,* 247. 

 Oncoeeras, 228. 

 Oneida conglomerate, 164, 218, 



220. 

 Onondaga limestone, 255. 



salt group, 232. 

 Onychodus 268,§* 279. 

 Oolyte, 75,§ 86,-§ 434,§ 435, 620. 



climate of, 452. 



limestones, 256. 



Lower and Upper, 435. 

 Oolytic epoch, 434. 



rocks, 63, § 62U. 

 Opal, 53.§ 



Open-sea formations, 304. 

 Opbiderpeton Brownriggii, 351. 

 Ophidians, 338. § 

 Ophileta compacta, 178, 189. 



complanata, 189. 



levata, 1S8 * 189. 



Owenana, 203. 



uniangulata, 192. 

 Ophioglossum, 271. 

 Ophiolyte, 73. § 

 Ophiuroids, 128,§ 303. 

 Opossum, 518, 519, 568. 

 Oracanthus Milleri, 308. 

 Orange Sand beds, 546, 547, 554. 



group, 493, 494. 

 Orbicula, 173. 



filosa, 203.* 

 Orbis rotella, 509. 

 Orbitoides, 131, § 500. 



limestone, 494. 



Mantelli,499,*509. 

 Orbitolina, 460, § 474. 



Texana, 456, 400* 466. 

 Orbitolites, 132, § 437. 



first of, 437. 

 Orbulina universa, 131.* 

 Orchestia, 120.*§ 

 Order of strata, 92. § 

 Oregon, Cretaceous in, 455. 



Quaternary in, 528. 



terraces in, 549. 



Tertiary in, 490, 495. 

 Oreocyon latjdens, 510. 

 Oreodon, 507, 508, 511. 



Culbertsoni, 511. 



gracilis, 507,* 511. 



occiden talis, 511. 



superbus, 511. 

 Organic acids, action of, 691. 



constituents of rocks, 47, § 

 59. 60, 61, 135, 604, 608, 

 612, 613, 616. 



nature, essential elements of, 

 48.§ 



remains, 47.§ 

 Orient, 13. 



Origination of species, 600, 603. 

 Origin of matter, life, spirit, and 



• of the spiritual element in 

 the earth : s arrangements, 

 not explained by reference 

 to heat, water, or attrac- 

 tion, 757. 

 Oriskany period, 164, 241. 



sandstone, 164. 

 Ormoceras, 203, 253. 



crebriseptum, 209. 



tenuifilum, 201,* 203, 215. 

 Onnoxylon Erianum, 279. 

 Ornithotarsus. 464. 

 Orodus, 304, .351. 



mamillari9,301,*304. 

 Orohippus, 505.*§ 



Orohippus agilis, 510. 



pumilus, 510. 

 Orthacantnus arcuatus, 343. 

 Orthis, 172,*§ 175, 187, 190, 199, 



228, 249, 252, 283, 371. 

 biforata, 207. 

 Billingsii, 174*176. 

 biloba, 226,* 229, 248. 

 calligramma, 207, 208. 

 carbonaria, 341. 

 costalis, 191.* 



electra 192. 



elegant'ula,' 206, 207* 208, 



229, 230, 247, 248, 249. 

 familv, 170,§* 174. 

 flabel"lulum,207,*248. 

 grandseva, 188* 189. 

 hybrida, 248. 

 imperator, 191. 



last of, 371, 373. 



lata 247 



lynx, 200* 203, 205, 206, 207, 



228. 

 Michelini, Tar. Burlingtonen- 



sis, 300* 303. 

 Michelini, 308. 

 musculosa, 243. 

 occidentalis, 200* 203, 205, 



232. 

 parva, 189. 

 pepina, 178. 

 porcata, 207. 

 range of, in time, 386.* 

 resupinata, 308. 

 Salteri, 206. 

 striatula, 172,* 207. 

 testudinaria, 200,* 203, 205, 



207, 232. 

 tricenaria, 200,* 203. 

 umbraculum, 303, 307,* 308. 

 Vanuxemi, 261. 

 varica, 239,* 240. 

 vespertilio, 207. 

 virgata, 208. 

 Orthisina, 172,§ 178, 199. 

 festinata, 178. 

 grandaeva, 188* 189. 

 Orthoceras, 187,§ 200, § 205, 



228, 229, 243, 253, 274, 289, 



300, 303, 332, 371, 409, 428, 



429, 483. 

 acicula, 279.* 

 analysis of, 74. 

 aculeatum, 342. 

 annulatum, 247, 248. 

 Blakei, 416. 

 bullatum,247, 250. 

 difiBdens, 191. 

 first of, 178. 

 ibex, 250. 

 implieatum, 248. 

 junceum, 201,* 203. 

 Lamarcki, 189. 

 laqueatum, 188,* 189. 

 moniliforme, 185, 209, 342. 

 nobile, 303. 

 Ozarkense, 189. 

 primigenium, 188,* 189. 

 range of, in time, 387.* 

 recti-annulatum, 191. 

 Rushense, 342. 

 tenuiseptum, 191. 

 undulatum, 248. 

 vagans, 208. 

 velox, 191. 



vertebrale, 201,* 203. 

 virgatum, 248. 

 Orthoceratite limestone, 163, 

 . 208. 



Orthoclase, 54. §* 

 Orthoclase-felsyte, 71. § 

 Orthonema, first of, 261. 

 Orthonota curta, 229. 



nasuta, 208. 



parallela, 205.* 



undulata, 273,* 274. 

 Orthophyre, 71. § 

 Orthopters, 335, 342, 351, 450. 



range of, in time, 388.* 

 Osborne group, 513. 

 Oscillations of level cause of, 

 761. 



of water-level, causes of, 761. 



through the Cenozoic, 586. 



through the Mesozoic, 482. 



through the Paleozoic, 391, 

 392. 

 Oscillatoria, 611. 

 Osmeroides Lewesiensis, 473,* 

 475, 476. 



Mantelli, 475. 

 Osmerus, 475.§ 

 Osmunda spicant, ash of, 365. 

 Osseous fishes, 265. §* 



first of, 403. 

 Ossipyte, 70,§ 72. 

 Osteolepis, 282. 

 Ostracoids, 122, § 188, 372, 475. 



range of, in time, 387.* 

 Ostrea, 385, 460, 495, 508. 



acuminata. 449. 



bellovacina, 513, 518. 



congesta, 457. 467, 508. 



deltoidea, 449. 



distorta, 450. 



divaricata, 509. 



expansa, 449. 



falcata, 456. 



frons, 476. 



Georgiana, 499,* 509. 



gregaria, 449. 



Knorri, 448. 



larva, 461,* 467, 468, 469, 476, 

 477. 



Levmerii, 475. 



Liassica, 429, 448. 



mallei formis, 467. 



Marshii,438,*449, 468. 



panda, 509. 



princeps, 519. 



sellasformis, 494, 499,* 509. 



soleniscus, 508. 



subovata, 468. 



vesicularis, 476. 



Vicksburgensis, 509. 



Virginiana, 510. 



Vomer, 509. 

 Otodus appendiculatus, 464,* 

 467. 



obliquus, 518. 

 Otozoum Moodii, 412,* 413,? 



417. 

 Ottawa basin, remarks on, 194, 



216, 380. 389, 587. 

 Ottawa River in existence, 287. 

 Outcrop, 94. §* 

 Outlining of land and water, 



767. 

 Overlap, 101 ,_§ 217. 

 Ovibos bombifrons, 567. 



cavifrons, 567. 

 Ovis, 520. 

 Ovula, 483. 



first of, 475. 

 Owen, D. D., analysis of lime 

 stone, 74. 



Lake Superior trap, 185. 



Galena lead-region, 197. 



