INDEX. 



683 



Silurian strata, foot-tracks in, 452. 



volcanic rocks, 55S. 



Simpson, Mr., on ice-islands, 135. 

 Siphwiia pyriformis, upper greensand, 249. 

 Siphonotreta tmguiculata, Silurian, 444. 

 Sivatherium, extinct ruminant, 182. 

 Skapter Jokul, eruption of, 521. 

 Skye, rocks of, 481, 580. 



, basaltic columns in, 483. 



, dikes in Isle of, 478. 



, sandstone in, 36. 



Slates of Devon, cleavage of, 603. 



Slaty cleavage, 602. 



Slickensides, term defined, 621. 



Smith, Mr., of Jordan Hill, on pleistocene, 



140. 

 Snags, fossil, 375. 



Snakes' eggs, fossil at Tonna, near Gotha, 125. 

 Soissonnais sands, 228. 

 Solenhofen, lithographic stone of, 302. 

 Solfatara, decomposition of rocks in the, 595. 

 Somma, 525. 



lava at, 478. 



Sopwith, Mr. T., models by, 57. 



Sorbv, Mr., on mechanical theory of cleavage, 



603. 

 Sortino, cave in valley of, 160. 

 South Devon and Cornwall, old red of, 419. 

 South Downs, view of, 274. 

 Sowerby, Mr. G, cited, 169. 

 Spaccoforno, inland cliffs at, 76. 

 Spain, volcanoes in, 6, 531. 

 Spalacotherium, Purbeck mammifer, 295, 457. 

 Spatangus (recent), 23 ; 8. radiatus, 238. 

 . . . ., with Serpula attached, 23. 

 Spezzia, gulf of, calcareous rocks in, 612. 

 SphmrexochiLS mirus, "Wenlock, 436. 

 Sphmrulites agariciformis, chalk, 253. 

 Sphenopteris crenaia, 361 ; 8. gracilis, 264 

 Spirifer disjunctus, 8. Verneuilii, 421; 3. 



glaber, 8. irigonalis, 406. 

 ..... mueronatus, 424; S. undulatus, 352; 8. 



WalcoUii, 318. 

 Spirolina stenostoma, eocene, 227. 

 Spirorbis carbonarius, coal, 3S4. 

 Spitzbergen, glaciers of, 142. 

 Spondylus spinosus, chalk, 247. 

 Sponges in chalk, 249. 

 Spongilla of Lamarck, in tripoli, 25. 



, spicula of, tripoli, 25. 



Springs, mineral. See Mineral springs, 626. 

 Staffa, basaltic columns in, 4S3. 

 Stauria asbrcemformis, Silurian, 403. 

 Steno on classification of rocks, 91. 

 Sternbergia, structure of, 368. 

 Stigmaria in fossil forest, Nova Scotia, 377. 

 Stigmaria and SigiUaria, 367. 



ficoides, coal, 368. 



Stirling Castle, rock of, altered by dike, 481. 

 Stockholm, post-pliocene beds near, 119. 

 Stokes, Mr., on petrifaction, 43. 

 Stonesfield, fossil mammalia, 310, 312. 



slate, 309. 



Storton Hill, footprints at, 337. 



Strata, term defined, 2. 



arrangement of, determined by fossils, 21, 



22. 

 . ..'., consolidation of, 34. 



, curved and vertical, 47, 58. 



, elevation of, above the sea, 44. 



. . . ., fossiliferous, tabular view of^ 104. 



. . . ., horizontality of, 15, 45. 



. . . ., metamorphic origin of, 596. 



, mineral composition of, 10. 



, outcrop of, 56. 



. . . ., tertiary classification of, 109. 



Stratification, forms of, 13, 16, 47. 



. . . ., unconformable, 59. 



Strickland, Mr., on now red sandstone, 336. 



Strike, term explained, 53. 



String ocephalus Burtinl, Devonian, 423. 



Stromboli, lava of, 574. 



Strophomena depressa, 436 ; S. grandis, 440. 



Studer, M., on Swiss Alps, 614. 



Studer, M., on boulders of Jura, 149. 



Stutchbury, Mr., cited, 324, 355. 



Sub-Apennine strata, 110, 173. 



Subsidence in drift-period, 141. 



Succinea amphibia, 29 ; 8. elongata, 124. 



Suffolk crag, 16S. 



Sullivan, Capt, chart of Falkland Islands, 88. 



Superga, near Turin, tertiaries of Hill of, 179. 



Superior, Lake, marl in, 36. 



Superposition of aqueous deposits, 96. 



Superposition of volcanic rocks, test of age, 



326. 

 Supracretaceous, term explained, 103. 

 Sus scrofa, tooth of, 166. 

 Sussex marble, 261. 

 Swansea, coal-measures near, 859. 

 . . . ., stems of Sigillaria at, 3T3. 

 Sweden, alum-schists of, 451. 

 Swiss Jura, structure of, 55. 

 Sydney coal-field, Cape Breton, 380. 

 Syenite, 564. 

 Syenitic granite, 564. 

 Synclinal line, term defined, 48. 



Table Mountain, strata horizontal in, 45. 



, granite-veins in, 567. 



Table of fossiliferous strata, 104 



Tails of homocercal and heterocercal fish, 353. 



Talcose gneiss, 590. 



.... granite, 564. 



Tapirus Americanus (recent), tooth of, 166. 



Tartaret, Puy de, cone of, 548. 



Teeth of mammals, fossil and recent, 165, 166, 



167, 219, 233, 311, 341. 

 Telerpeton Elginense, old red, 412. 

 Tellina obliqua, pleistocene, 155. 

 Temnechinus excavatus, coralline crag, 172. 

 Teneriffe, Peak of, 509, 511. 

 Tentaeulites annulatus, Silurian, 439. 

 Terebellum convolutum, T.fusiforme, 213. 

 Terebratula (Atrypa) affinis, 434 

 biplicata, T. carnea, T. Defrancii, T. 



oatoplicata, T. plicatilis, T. pumilus, 246. 

 digona, 308 ; T. fimbria, 315 ; T. hastata, 



406; T.lyra, 251. 

 navieula, 431 ; T. porrecta, 423 ; T. sella, 



259 ; T. Wilsoni, 433. 

 Twedina personata, fossil wood bored by, 



24 

 Teredo navalis boring wood, 24. 

 Terra del Fuego, 145. 

 . . . ., Fucus giganteus in, 242. 

 Tertiary, term explained, 109. 



deposits, 178, 189, 190. 



strata, tabular view of. 104. 



Testudo atlas, of Sewalik Hills, 182. 



Texas, chalk in, 255. 



Thames valley, freshwater deposits in, 152. 



Thamnastrma, coral-rag, 303. 



Thanet sands described, 221. 



Thecodont saurians, 342, 355. 



Thecodontosaurus, tooth of, 355. 



Thecosmilia annularis, 303. 



Thelodus, shagreen-scales of, 432. 



Thirria, M., on oolitic group in France, 329. 



Thuja occidentalis, in stomach of mastodon, 



144. 

 Thurmann, M., cited, 55, 2S0, 308. 

 Tilestones, 430. 



Tilgate Forest, remains in, 262. 

 Till, term explained, 133. 



, origin of, 134 



Tin, veins of, in Cornwall, 620, 627. 

 Tiverton, trap-porphyry near, 555. 

 Tongrian system of M. Dumont, 1S8. 

 Touraine, faluns of, 175. 

 Trachyte, 466. 



, of Hungary, 565. 



Trachytic rocks, older than basalt, 522. 



Transition, term explained, 91, 429. 



Trap, term explained, 460. 



.... dike in Fifeshire, 557. 



. . . ., globular structure of, 486. 



, intrusion of, between strata, 482. 



