INDEX. 



901 



Porocrinus, 204. 

 Porous rocks, 63. § 

 Porphyritic rocks, 64, § 306. 

 Porphyry, 49, 73.§ 

 Portage epoch, 254, 276. 



group, 254, 276. 

 Porter's Creek group. 493. 

 Portheus molossus, 467. 

 Port Hudson group, 547. 

 Port Kennedy bone-cave, 567. 

 Portland dirt-bed, 435, 436 * 

 452. 

 Oblyte, 435. 

 stone. 435. 

 Portlandian group, 435. 

 Portugal, Carboniferous in, 



347. 

 Posidonia minuta, 416, 428. 



Stella, 416. 

 Posidonomya. See Posidonia. 

 Positions of strata, 91. § 

 Post-meridian series, 375. 

 Post-tertiary. See Quater- 

 nary. 

 Pot-holes, 648. 

 Potamoinya mactriformis, 501 * 



508. 

 Potash in plants, 365. 

 Potassium, 51. § 

 Poteriocrinus, 303, 341. 

 Missouriensis, 298,* 303. 

 ornatissimus, 278. 

 Potsdam beds, thickness of, 

 381. 

 beds overlaid by Carbonifer- 

 ous, 232. 

 epoch, 163, 166 

 green-sand of, 177. 

 life of, all marine, 169. 

 recent genera in, 174. 

 Pourtales, E. F., on occurrence 



of Rhizopods, 678, 686. 

 Powell, J. \\ r ., on Colorado Ba- 

 sin, etc., 791, 792, 835. 

 Pozzuolana, 68 § 

 Pozzuoli, change of level, at, 



584* 

 Prasarcturus gigas, 285. 

 Prairies, distribution of, 44. 

 Pratt, J. H., figure of the earth, 



816, 83-2. 

 Prehnite. 734. 

 Pre-meridian series, 375. 

 Pressure against continents, 



826. 

 Prestwich, coal of England, 

 346. 

 equivalency of coal-beds, 

 347. 

 Prestwichia anthrax, 350.* 



rotundata, 350* 

 Prevost, on volcanic action, 733, 



746, 749, 832. 

 Primal series, 375. 

 Primary, 489. § 

 Primordial period, 163, 166. 



European, 179. 

 Prince Edward's Island, Trias- 



sic in, 404. 

 Prionastrea oblonga, 436,* 449. 

 Prionodon, 510. 

 Pristis bisulcatus, 518. 

 brachiodon, 509. 

 curvidens, 509. 

 ensidens, 509. 

 Proboscidians, range of, in 



time, 589.* 

 Procamelua, 508, 511. 

 Productella subalata, 274. 



Productus, 172 ,*§ 256, 260,261, 

 278, 283, 284, 288, 299, 307, 

 332, 371, 372. 



aculeatus, 173* 



cora, 341. 



costatus, 350. 



elegans, 303. 



family, 170,§* 174. 



first of, 260, 283. 



Flemingii, 303. 



horridus, 372. 



last of, 371,373. 



longispinus, 307,* 308, 350, 

 352 



Martini, 304, 362. 



ir.uricatus, 341. 



Nebrascensis, 332,* 341 



punctatus, 300,* 303, 341. 



range, of, in time, 386 * 



scabriculus, 308, 350. 



semireticulatus, 173* 341, 

 352. 



subalatus, 272* 274. 



sulcatus, 352. 

 Proetus, 174,§ 204, 240, 243, 249 



crassimarginatus, 261. 



Stokesii, 248. 

 Progress of life, the basis of 

 subdivisions into ages, 138 



system of, in geological time, 

 592. 

 Progress in earth's develop- 

 ment, 830. 

 Propylyte, 78 § 

 Prosoponiscus problematicus, 



372. 

 Proteacene, 514, 515. 

 Protean beds, 294. 

 Proteus, 337. § 

 Protichnites, 176.* 



7-notatus, 176,* 178. 

 Proterosaur, 338, § 373 § 

 Proterosaurus Speneri, 372.* 

 Protocardium Hillanum, 476 

 Protohippus, 507, 511. 

 Protogine, 75. § 

 Protolycosa, 342 



anthracophila, 351. 

 Protomeryx, 506, 511. 

 Protophytes, 135, § 496* 



Corniferous, 257.* 



Cretaceous, 471. 



Tertiary, 513 

 Protopteris peregrina, 248. 

 Protospongia fenestrata, 180. 

 Prototaxites, 245, § 258, 271. 



Logani, 258.* 

 Protozoans, 116,§ 131, § 615. 



classification of, 131- 



in Tertiary, 499. 



number of Silurian, 249. 

 ! Protozoic schists, 179. 

 Psammobia lintea, 509. 

 Psammodus, 304. 

 Psaronius, 348, 371. § 



Erianus, 271. 

 Pseudobuccinum, first of, 477, 



483. 

 Pseudoliva, 508. 



vetusta, 509. 

 Pseudomonotis, 342, 367. 



Hawnii. 367 



speluncaria, 372. 

 Pseudomorphism, 710, § 766. § 

 Pseudo-scorpions, 349, 351. 

 Psilophyton, 198,* 257, § 268, 

 271, 348. 



princeps 245, 258,* 271. 

 Psilotites, 348. 



Psilotum, 258. 



Pteranodon ingens, 466, 468. 



occidentalis, 468. 



velox, 468 

 Pteraspis, 247. 



Banksii, 245. 246,* 247. 



truncatus, 247. 

 Pterichthys, 246. 



Asmusi, 286. 



Milleri, 285,* 286. 

 Pterinea, 284. 



demissa, 205* 



flabella, 273,* 274. 



retroflexa, 247. 



sublevis, 247. 

 Pteris aquilina, 365. 

 Pterocera, 483. 



Fittoni, 475. 



Pterodactyl, 339,§ 446, 449, 450, 



474, 475, 476. 

 Pterodactylus crassirostris, 

 446,* 449. 



Cuvieri, 476. 

 Pteronites Chemungensis,279.* 

 Pterophyllum Altaense, 349. 



graminoides, 407,* 409. 



Haydenii, 460 



inflexum, 349. 



Jaegeri, 425,* 426,- 429. 



longifolium, 409, 429. 



Munsteri,429. 

 Pteropods, 125. § 



in Green-sand, 208. 



number of Silurian, 249. 



range of, in time, 387.* 



Silurian, 203 

 Pterosaurs, 339, § 443, 446, 464, 

 466, 476, 485 



range of, in time, 589. 

 Pterospermites Sternbergii, 

 460. 



Haydenii, 460. 



rugosus, 460. 

 Pterozamites Munsteri, 429 

 Pterygotus, 240, 245,253, 282, 



bilobus, 245, 246* 

 Ptilocarpus, 349. 

 Ptilodictya L 203. 



acuta, 20 <. 



dichotoma, 207. 



fenestrata, 191.* 



scalpellum,247. 

 Ptychaspis, 168, 178, 190. 

 Ptychoceras, 462. 

 Ptychodus, 475 § 



Mortoni, 464,* 467. 



occidentalis, 467. 

 Ptvchophyllum, 206. 

 Pudding-stone, 65 § 

 PuffinusConradi,510. 

 Pulaski shales, 196. 

 Pullastra arenicola, 429. 

 Pulmonates, 333 § 

 Pulvinites, first of, 477. 

 Pumice, 77 § 

 Pumiceous rocks, 64. § 

 Pupa, 332,§ 358. 



Vermilionensis, 333* 342. 



vetusta, 333,* 339, 342. 

 Purbeck beds, 435. 

 Purpura tetragona, 519. 

 Purpuroidea nodulata, 449. 

 Putorius, 520 § 

 Pycnodonts,475. 

 Pycnodus, 475. 



gigas, 428. 



Mantelli, 450. 



