6oo 



INDEX. 



Spatangidce, 109. 



Spatangus t 109. 



Spathobatis, 342. 



Spatularia, 333. 



Spermophilus, 460. 



Sphcerexochus, 170. 



Sphcerococcites, 478. 



Sphceronites, 129, 133. 



Sphagodus, 335, 337. 



Sphenodon, 363. 



Sphenodus, 340. 



Sphenopteris, 475, 482, 483, 486, 495, 493. 



Sphenothallus, 479. 



Sp/ienofroc/iws, 96. 



Spinacidce, 336. 



Spiniferites, 69. 



Spirtfer, 202, 205. 



SpiriferidcR, 201-203, 205. 



SpiVyerina, 205. 



Spirigera, 206. 



Spirophyton, 474, 479. 



Spirorbis, 137, 138, 139. 



&pirula, 274, 275, 294 



Spirulidce, 275, 296. 



Spirulirostra, 296. 



Spondylus, 222. 



Spongida, characters of, 67 ; distribution 

 of, in time. 67, 68. 



Spongilla, 69. 



Spongillopsis, 69. 



Squa'lodon, 421, 422. 



Squaloraia, 842. 



Squamata (Reptilia), 355. 



Squatina, 340. 



Squilla, 177. 



Stagonolepin, 356, 367. 



Stauria, 99 



Stauridce, 99, 101. 



Staurocephalus, 170. 



St Cassian beds, 531. 



Steganodictyum, 522. 



Stellaster, 114, 115. 



Stenaster, 114, 115. 



Sfcerwoscmnts, 367. 



Stephanophyllia, 543. 



Stereodelphis, 420. 



Stereognathus, 405, 410. 



Sternbergia, 482, 483, 489, 491. 



Stigmarm, 474, 482, 493. 



Stomapoda, characters of, 177 ; distribu- 

 tion of, in time, 177. 



Stonesfleld Slate, 536 ; Mammals of, 410. 



Strata, contemporaneity of, 14. 



Strepsirhina, 464. 



Streptospondyltis, 368. 



Stringocephalus, 204. 



Stn'a;, 395. 



Strom atopora, 69, 71. 



Strombidce, 246. 



Strombodes, 98. 



Strombus, 246. 



Strophalosia, 530. 



Strophodus, 339, 340, 410. 



Strophomena, 208, 209. 



Strophomenidce, 202, 203, 208. 



Struthio, 394. 



Sturionidce, 322, 333. 



Stylina, 537. 



Stylonurus, 173. 



Siichosaurus, 367. 



Sudden Extinction of marine animals,38,39. 

 , 430. 



Su$, 430. 

 Synapta, 135. 

 Synastrcea, 533, 

 Syngnathidce, 319. 

 Synnelia, 89. 

 Syringopora, 98. 

 Syringoxylon, 474. 



Tabulse, 93 



Tabulata, 96 : distribution of. in time, 



97. 



Tceniaster, 117. 

 Tceniopteris, 498. 

 Talitrus, 176. 

 TaZpa, 463. 

 Talpidce, 463. 

 Tapiridce, 426. 

 Tapirus, 426. 

 Taxocrinus, 126. 

 Taxodium, 500, 501, 503. 

 Tectibranchiata, 244. 

 Tcleosaurus, 367. 

 Teleostei, characters of, 315; distribution 



of, in time, 315 ; sub-orders of, 315-319. 

 Telerpeton, 356, 362, 363. 

 Tellina, 237. 

 Tellinidce, 218, 237. 

 Telmatornis, 390, 392. 

 Temnocidari-s, 109. 

 Temnopleurus, 110. 

 Tentaculites, 139, 270, 271, 272. 

 Terebella, 137. 

 Terebra, 248. 

 Terebratella, 200, 204. 

 Terebratula, 198, 201, 203. 

 Terebratulidce, 202-204. 

 Terebratulina, 203. 

 Teredo, 240. 



Tertiary Rocks, classification of, 547. 

 Tesselata (Crinoidea), 128. 

 Test, of Foramintfera, 61; of Echinoidea, 



103 ; of Cirripedia, 250. 

 Testacella, 267. 

 Testudinidce, 358, 359. 

 Tetrabranchiata, characters of, 277 ; shell 



of, 279 ; distribution of, in time, 280. 

 Tetraceros, 439. 

 Tetradecapoda, 176. 

 Tetragonolepis, 324. 

 Tetragrapsus, 82, 83. 

 Tetraonidce, 394. 

 Tetraprotodon, 429. 

 Teudopsis, 295. 

 Teuthidce, 275, 277, 294. 298. 

 Textularia, 64, 65. 

 Thallogens, 473. 

 Thamnastrcea, 537. 

 Thamnograpsus, 78. 

 Thanet Sands, 548. 

 7'Aeca, 270. 

 Thecaphora, 74, 76. 

 Thecidce, 97, 100. 

 Thecididce, 204. 

 Thecidinm. 204. 205, 534. 

 Thecodontia, 367. 

 Thecodontosaurus, 368. 

 Thecosmilia, 537. 

 Thecosomata (Pteropodd), 269. 

 Thelodus, 335, 337, 338. 

 Thetis, 238. 



Thinning out of beds, 36-38. 

 Thoracica (Cirripedia), 150. 



