INDEX. 



823 



Silver Islet, 186. 



Silver mines of Utah, 296. 



Simeto, erosion of the, 643. 



Simosaurus, 428, 429. 



Sindree, changes of level at, 585. 



Sinemurian group, 435. 



Sink-holes, 654. 



Sinupallial, 189. § 



Siphonated Mollusks, 482. 



Siphonia lobata, 471,* 474. 



pyriformis, 476. 

 Siphonotreta, 173.*§ 

 unguiculata, 173,* 208. 

 range of, in time, 386.* 

 Siphuncle, 124,§ 201. 

 Siredon, 337.§ 

 Siren, 337.§ 

 Sivatherium, 520. § 

 Siwalik Hills, Mammals of, 520. 



Miocene in, 513. 

 Skiddaw slates, 163, 192. 

 Slate, 49, 69, § 649. 

 v siliceous, 73. § 



Slaty cleavage or structure, 

 89,§ 628, 741. 

 origin of, 741. 



production of, in glacier-ice, 

 683. 

 Slaty rocks, 63.§ 

 Slides, 655. 



Slope of loose materials, 630. 

 mountains, 16, 18. §* 

 Rocky Mountains, 17.* 

 volcanic mountains, 18.* 

 Sloth, 565, 610. 



tribe, earliest of, 518. 

 Smelt, 475. 

 Smilax, 497. 

 Smithsonite, 197. 

 Snake River, volcanic rocks of, 



524. 

 Snakes, 121, § a38.§ 502, 509, 



510, 516, 592, 598. 

 Snipes, 466.§ 



Snow-line on heights, 679. 

 Snowy Owl, 573. 

 Soapstone, 55, § 72.§ 

 Soda in plants, 365. 



salts, 630. 

 Sodium, 51 § 

 Soils limiting life, 610. 

 Soissonnais beds, 513. 

 Solemya, 385. 

 Solen, 508. 



Solenhofen beds, 436, 446. 

 Solenocaris, 267. 

 Solenomya, first of, 261. 



radiata, 342. 

 Solfataras, 718. § 

 Solitaire, 580, 581.* 

 Soluble silica, 53, § 478.§ 

 Solvent power of water, 687. 

 Soundings off New Jersey and 



Long Island, 422.* 

 South America, Carboniferous 

 in, 345. 

 Cretaceous in, 470. 

 drainage of, 25. 

 fiords in, 534. 

 glaciers in, 536. 

 mean height of, 14. 

 Quaternary in, 532. 

 Quaternary Mammals of, 568, 



571. 

 surface form of, 24.* 

 temperature of. 41. § 

 trends in, 36. 

 Southbury Triassic area., 405, 

 419. 



South Carolina, Archaean in 

 150. 

 Cretaceous in, 455. 

 in the Cretaceous, 479. 

 phosphate beds of, 495 § 

 Tertiary in, 490, 491, 494, 495. 

 511. 

 South Sea. See Pacific. 

 Southwest Pass bar at, 652. 

 Sow-bug, 122. §* 

 Spain, Carboniferous in, 344, 

 345, 347. 

 Cretaceous in , 470. 

 in the Quaternary, 573. 

 Lower Silurian in, 207. 

 plateau of, 21. 

 Triassic in, 424. 

 Spalacodon, 519. 

 Spalacotherium Brodiei, 450. 

 Spathic iron, 318, 688. 

 Spatularia, 264. 



Species. See Life, Animals, 

 Plants, Migrations. 

 representative, 599. 

 Specific gravities of rocks, 65. 



heats of rocks. 698. 

 Specular iron, 59, 74. 

 Speeton clay, 476. 

 Sphaerium, 617. 

 Sphasronites, 207. 

 Sphagnum, 362,364,616.- 

 ash of, 365. 

 commune, 365. 

 composition of, 362. 

 Sphagodus, 247. 

 Sphalerite, 197. 

 Sphenophyllum, 328, 331, 348. 

 antiquum, 271. 

 emarginatum, 331. 

 Schlotheimii, 327,* 330. 

 Sphaenopoterium obtusum, 

 302. 

 cuneatum, 302. 

 Spbaerozoum orientale, 133.* 

 Sphaerulites, 460, 462. 



Hoeninghausi, 472,* 475. 

 Sphenopteris, 271, 348, 349, 370, 

 433. 

 anthriscifolia, 349. 

 artemisiaefolia, 331. 

 Bocenica, 497. 

 glandulosa, 331. 

 Gravenhorstii, 326,* 330. 

 Harttii, 271. 

 Hitchcockiana, 271. 

 Hoeninghausi, 271. 

 Hookeri, 283. 

 Humphriesiana, 283. 

 latifolia, 331. 

 Mantelli, 450. 

 Newberry i, 331. 

 obtusiloba, 331. 

 plumosa, 449. 

 polyphvlla, 331. 

 Schimperi, 283. 

 tridactylites, 330. 

 Spherulites, 77, § 86. 

 Spicula of Sponges, 132* 257* 



472. 

 Spiders, 121 ,§ 331, 335, 349, 351, 

 441,* 613. 

 first of, 335.* 

 range of. in time, 388.* 

 Spinax Blainvillii, 262.* 

 Spirangium, 349. 

 Spirifer, 171,*§ 228, 243,§ 252, 

 278, 283, 284, 299, 307, 371, 

 409, 448. 

 acuminatus, 256, 260 * 261. 



Spirifer alatus, 372. 



arenosus, 232, 242* 243. 



arrectus, 243. 



biplicatus, 300 * 303. 



bisulcatus, 300,* 303. 



cameratus, 332* 341. 



Clannyanus, 373. 



concinnus, 240. 



crispus. 23u, 248. 



cultrijugatus, 261. 



cuspidatus, 306, 308. 



disjunctus, 99 * 283, 306, 307, 

 308. 



duodenarius, 256. 



fimbriatus, 261. 



family, 170,§* 174. 



giganteus, 9y.* 



glaber, 304, 307 * 308. 



granuliferus, 274. 



gregarius, 256, 260,* 261. 



Homfrayi, 416. 



incrassatus, 303. 



increbescens, 303. 



Keokuk, 3 >3. 



last of, 437. 



lineatus, 341, 350. 



macropleura, 237, 239,* 240. 



Meusebachanus, 341. 



mucrouatus, 272,* 274. 



Munsteri, 428, 429. 



Niagarensis, 226,* 229. 



perlamellosus, 240. 



plicatus, 247. 



pyxidatus, 243. 



radiatus, 228, 229, 248. 



range of, in time, 386.* 



rostratus, 429. 



rugosus, 240. 



speciosus, 303. 



spinosus, 303. 



striatus, 171,* 341. 



sulcatus,226,*229 248. 



umbonatus, 272,* 274. 



Urii, 350, 373. 



Waleotti, 438,* 448. 

 Spiriferina cristata, 372, 373. 



Kentuckensis, 341. 



octoplicata, 300,* 303, 393. 

 Spirigera lamellosa, 307,* 308. 



subtilita, 341. 

 Spiritual element in the earth's 



arrangements, 758. 

 Spirophyton, 296, 331. 



cauda-galli, 255,* 257, 331. 

 Spirorbis, 333, 341, 358, 385. 



carbonarius, 333,* 342. 

 Spirula, 125. § 



Spitsbergen, Carboniferous in, 

 293. 



glaciers in, 675. 



Permian in, 370. 



Tertiary plants of, 514. 



Triassic in, 424, 429. 

 Splint-bones, 601. 

 Spondylus, 475 



Sponges, 132,§ 177, 190, 202, 

 228, 257, 261, 300, 436, 460, 

 472, 608, 611. 



Calciferous, 188. 



Chazy, 190. 



Corniferous, 257.* 



Cretaceous, 471. 

 first, 175, 180. 

 number of Silurian, 249. 

 Potsdam, 175, 177.* 



Quebec. 190. 

 siliceous, 611,612. 

 spicula of, 60, 132,* 257,* 261, 

 300, 471,* 472. 



