INDEX. 



681 



Peaten papyraceous, 3S6 ; P. quinquecostatus, 



247. 

 Pegmatite, variety of granite, 562. 

 Pentacriiius Briareus, lias, 320. 

 Pentarmerus Knightii, 433 ; P. laivis, 488. 

 Pentland hills, Mr. Maclaren on, 131. 

 Peperino, volcanic tuff, 474. 

 Pepys, Mr., cited, 41. 

 Permian flora, distinct from that of coal, 353. 



formation of Thuringia, 356. 



group described, 350. 



Persia Mulleti, lower greensand, 25S. 



Petrifaction of fossil wood, 39. 



...., process of, 43. 



Philippi, Dr., on fossil shells near Naples, 118. 



, on Hesse Cassel beds, 186. 



, on marine shells in caves of Sicily, 160. 



. . . ., on tertiary shells of Sicily, 156. 

 Phillips, Prof, cited, 30S, 318. 

 . . . ., on cleavage, 603. 



, on terminology, 102. 



, Mr. W., on kaolin of China, 11. 



Phacops caudatus, Silurian, 436. 

 Phascolotherixim Bucklandi, jaw of, 312. 

 Pha-sianetta Heddingtonensis, coral-rag, 39. 

 Phlebopteris contigua, oolite, 314. 

 Pholadomyafidicula, oolite, 315. 

 Phonolite, or clinkstone, 472. 

 Phorus extensus, London clay, 218. 

 Phosphate of lime, 251. 

 Phragmoceras ventricosum, Ludlow, 434. 

 Phryganea, indusiaz of, 201. 



, (recent), larva of, 201. 



Phyllade or clay-slate, 590. 



Physa Bristovii, Purbeck, 295. 



.... columnaris, P. hypnorum (recent), 29. 



Pictou, Nova Scotia, calamites near, 318. 



Pilla, M, on age of Carrara marble, 612. 



Pisidium amnieum, 133. 



Pisolitic limestone of France, 235. 



Pitchstone, or retinite, 474. 



Placodus gigas, teeth of, 335. 



Plagiosloma giganteum, 318 ; P. Hoperi, P. 



spinosum, 247. 

 Planitz, tripoli p£ 26. 



Planorbis discus, 209 ; P. euomphalus, 29, 211. 

 Plas Newydd, rock altered by dike near, 480. 

 Plastic clays, 219. 

 Playfair, cited, 45, 92. 

 ...., on faults, 62. 



. . . ., on Huttonian theory of stratification, 60. 

 Pleetrodus mirabilis, 432. 

 Plesiosaurus dolichodtirus, 323. 

 Pleurod.ictyum problematicum, 425. 

 Plev/rotoma attenuata, 216 ; P. rotata, 31. 

 Pleurotomaria carinata, P.flanimigera, 406. 

 Pleurotomaria granxdata, P. ornata, 315. 

 Plieninger, Professor, on triassic mammifer, 340. 

 Pliocene, newer, period, 126. 



. . ., newer, strata, 152. 



. . . strata in Sicily, 155. 



. . ., older, in United States, 180. 



. . . strata, 167. 



. . . period, volcanic rocks of, 529, 530. 



. . ., term defined, 116. 

 Plomb du Cantal, described, 552. 

 Plumbago in Massachusetts, 596. 

 Plutonic rocks, 7, 573. 



... of carboniferous period, 580. 



... of oolite and lias, 579. 



. . ., recent and pliocene, 574. 



... of Silurian period, 5S1. 



. .., age of, how tested, 573. 

 Plutonic and sedimentary rocks, diagram of, 576. 

 Pluvial action, effects of, 279. 

 Podocarya, fruit of, oolite, 313. 

 Poggendorf, cited, 594. 

 Poikilitic formation, 350. 



, term explained, 332L 



Polyccslia 'profunda, Permian, 403. 

 Pomel, M, on mammalia of Auvergne, 203, 421, 

 Ponza Islands in Mediterranean, 486, 605. 

 Porphyritic granite, 563. 

 Porphyry, 467, 468. 



Portland, Isle of, fossil forest in, 297. 

 Portland stone, 300. 



Portlock, Col., on Tyrone Silurian rocks, 443. 

 Posidonia minuta, triassic, 334. 

 Posidonomyal, Richmond, U. S., 331. 



Beoheri, carboniferous, 410. 



Post-pliocene formations, 116. 



, period, volcanic rocks, 523. 



Potsdam sandstone at Keeseville, 451. 



sandstone, tracks on, 452. 



sandstone in Canada, 446. 



Pottsville, coal-seams near, 383. 



, footprints of reptile near, 400. 



Pozzolana, 36. 



Pratt, Mr., on ammonites, 304. 



, on extinct quadrupeds of Isle of Wight, 



209. 

 Precipitation of mineral matter, 41. 

 Predazzo, altered rocks at, 581. 

 Prestwich, Mr., cited, 69. 



, on Weald denudation, 281. 



, on English eocene strata, 20S, 212, 216, 219. 



...., on coal-measures of Colebrook Dale, 62, 



8S5. 

 Prevost, M. C, on Paris basin, 223, 224, 225. 

 Productus oalvus, P. horridus, 352. 

 Productus antiquatus, P. semireticulatus, 



405. 

 Progressive development, theory of, 453. 

 Protogine, or talcosc granite, 564. 

 Psammodus porosus, tooth of, 409. 

 Psaronites in Germany and France, 357. 

 Pseudocrinites bifasciatus, 436. 

 Pterichthys, old red, 419. 

 Pterodactylus crassirostris, 302. 

 Pterophyllum comptum, 314. 

 Pterygotue Anglicus, 415; P. proble?naticus, 



416. 

 Ptychodus decurrens, tooth of, 249. 

 Puggaard, Mr., on Moen drift, 2S5. 

 Pamice, 469. 



Pupa musoorum, 124 ; P. tridens, 30. 

 Purbeck beds, 291, 293. 

 Purpwoidea nodulata, oolite, 308. 

 Puy de Tartaret, 548. 

 Puy de Pariou, 551. 

 Puzzuoli, elevation and depression of land at, 



525. 



, post-pliocene strata at, 117. 



Pygopterus mandibularis, scale of, 354. 

 Pyrenees, cretaceous rocks of, 589. 



, curvatures of strata in, 58. 



, granite of, 593. 



, nummulitic formation of, 230. 



Pyrocene, or augite, 465. 



Pyrula reticulata, coralline crag, 172. 



QrjADRtriiANA, fossil, 219. 



Quarrington Hill, basaltic dike near, 520. 



Quartz, 561. 



Quartzite, or quartz-rock, 589. 



HADiouTEBfoliaceus, B. radiosus, 253. 



Mortoni, chalk, 248. 



Radnorshire, stratified trap of, 558. 

 Rain-prints, fossil in coal-shale, 3S4. 

 Eamsay, Prof. A. C, on denudation, 63. 



. . ., on granite in Arran, 584 



. . ., on section near Bristol, 102. 



. . ., on Welsh glaciers, 137. 



..., on foliation of crystalline schists, 609. 



. . ., on Caradoc sandstone, 438. 

 Bastriies peregrinus, 442. 

 Recent strata defined, 117. 



, near Naples, 117. 



Eedfield, Mr., on glacial fauna in America, 139. 



...., on fossil fish, 349. , 



Red sandstone, origin of, 342. 



Red Sea and Mediterranean, distinct species in, 



100. 

 ...., saltness of, 345. 



Reptile in old rod sandstone of Morayshire, 412. 

 Reptiles, carboniferous, 396, 397. 

 .... of lias, 322. 



