[NDEX. 



681 



Peeten jyapi/racetts, 886; P. quinquecostatus, 



Ml. 

 Pegmatite, variety of granite, 562. 

 Pentacrinus Briareus, ]ias, 320. 

 Petito/morus Knightii, 433 ; P. Imvis, 48S. 

 Pentland liills, Mr. Maclareu on, 131. 

 Peperino, volcanic tuff, 474. 

 Pepys, Mr., cited, 41. 

 Permian flora, distinct from that of coal, 353. 



formation of Ttiuringia, 356. 



group described, SSO. 



Perna 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 ci^ed, 308, 318. 



, on cleavage, 603. 



, on terminology, 102. 



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

 Phacops caudatus, Silurian, 436. 

 Phaseolotherium Bucklandi., jaw of, 312.. 

 Phasianella Heddingtonemis, coral-rag, 39. 

 Phlebopteris contigua, oolite, 314, 

 Pkoladomyajidioula, oolite, 315. 

 Phonolite, or clinkstone, 472. 

 Phorus extensus, London clay, 21S, 

 Phosphate of lime, 251. 

 Phragmoeeras ventficosum, Ludlow, 434. 

 Phryganea, indusicB of, 201. 

 ^..., (recent), lar'oa of, 201, 

 Phyllade or clay-slate, 590. 

 Physa Bristovii, Purbeck, 295. 



columnaris, P. hypnorwn (recent), 29, 



Picton, Nova Scotia, calamites near, 318. 



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



Pisidium amnicum, 133. 



Pisolitic limestone of France, 235, 



Pitchstone, or retinite, 474. 



Placodus gigas, teeth of, 335. 



PLagiostoma gigaidetom, 318; P. Roperi, P. 



S2^iiiosum, 247. 

 Planitz, tripoli uf, 26. 



Planoi'Ms discus, 209 ; P. euompJialus, 29, 211. 

 Pias Newydd, rock altered by dike near, 480. 

 Plastic clays, 219. 

 Playfair, cited, 45, 92. 



, on fiiults, 62, 



, on Huttonian theory of stratification, 60, 



Plectrodus mirnbilis, 432. 

 Plesiosaurus dolichodiirus., 323. 

 Pleurodictyum prohlematicum, 425. 

 Pleurotoma attenuata, 216 ; P. rotata, 31. 

 Pleurotomaria carinata, P.flamTnigera, 406. 

 Plearotomaria granulata, P. ornata, 815. 

 Pheninger, Professor, on triassic mammifer, 340. 

 Pliocene, newer, period, 126. 

 . . . ., newer, strata, 152. 



strata in Sicily, 155. 



, older, in United States, ISO. 



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, 5T9. 



, 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, 813, 

 Poggendorf, cited, 594. 

 Poikilitic formation, 350. 



, term explained, 332. 



Polyccaliaprofimda, 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, 29T. 

 Portland stone, 800. 



Portlock, CoL, on Tyrone Silurian rocks, 443. 

 Posidonia minuta, triassic, 334. 

 Posidonomya ?, Kichmond, 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, 883. 



, footprints of reptile near, 400. 



Pozzolana, 86. 



Pratt, Mr., on ammonites, 804. 



on extinct quadrupeds of Isle of Wisht, 



209. 

 Precipitation of mineral matter, 41, 

 Predazzo, altered rocks at, 581, 

 Prestwich, Mr., cited, 69. 



, on "VVeald denudation, 281. 



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

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



355. 

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

 Productus oalvus, P. horridus, 852. 

 Productus antiqiuitus, P. semireticidatus, 



405. 

 Progressive development, theory of, 453, 

 Protogine, or talcose granite, 564 

 Psammodus porosus, tooth of, 409. 

 Psaronites in Germany and France, 357, 

 Pseudocrinites bifasciatus, 436, 

 Pteriehthys, old red, 419. 

 Pterodaetylus crassirostris, 302, 

 Pteropliyllum comptum, 314. 

 Pterygotue Anglicus, 415; P. problematicus^ 



416, 

 Ptychodus decurrens, tooth of, 249. 

 Puggaard, Mr., on Mben drift, 285. 

 Pumice, 469. 



Pupa onuscorum^ 124; P. tridens, 30. 

 Purbeck beds, 291, 293. 

 Purpxoroidea nodxblata^ oolite, 308. 

 Puy de Tartaret, 548. 

 Puy de Pariou, 551. 

 Puzzuoli, elevation and depression of laud at, 



525. 



, post-pliocene strata at, 117. 



Pygopterus mandibular is, 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 reticulatoi, coralline crag, 172. 



QtrADRUMAisrA, fossil, 219. 



Quarrington Hill, basaltic dike near, 520, 



Quartz, 561. 



Quartzite, or quartz-rock, 589, 



'Rkdiout^?, foliaeeus, B. radiosus, 253, 



Morto7ii, chalk, 248. 



Eadnorshire, stratified trap of, 558. 

 Bain-pi'ints, fossil in coal-shale, 384. 

 Eamsay, Prof. A. C, on denudation, 68, 



, on granite in Arran, 584. 



. . . ., on section near Bristol, 102. 

 . . . ., on Welsh glaciers, 137, 



, on foliation of crystalline schists, 609. 



, on Caradoc sandstone, 438, 



Rasiriies pcreg rinus, 442. 

 Eecent strata defined, 117, 



, near Naples, 117. 



Eedfield, Mr., on glac-ial fauna in America, 139. 

 ...., on fossil fish'; 849. 

 Eed sandstone, origin of, 842. 

 Eed Sea and Mediterranean, distinct species in, 

 100. 



, sal tn ess of, 845, 



Eeptile in old rod sandstone of Morayshire, 412i, 

 P.eptiles, carboniferous, 396, 397, 

 , , . . of lias, 822, 



