Spirialis, 347, *351. 
Spirifera, *371. 
Spiriferidee, *371. 
Spiriferina, *372. . 
Spirigera, 373. 
Spiroglyphus, 249, 
Spirula, 9, *178. 
Spirulide, *178. 
Spirulirostra, *177. 
Spisula, 477. 
Sponstylobolus, 387. 
Spondylolites, 183. 
Spondylus, 7, 30, 35, 38, 55, 
*413, 
Spongaria, 180. 
Spongiobrancheea, *354. 
Sporadic species, 51. 
Sportella, 457. 
Stalagmium, 427. 
Steganostoma, 308. 
Stenoceras, 197. 
Stenogyra, *293. 
Stenopus, *289. 
Stilifer, 9, *241. 
Stoastoma, *310. 
Stomatella, *267. 
Stomatia, *268. 
Stomatia, 236. - 
Straparollus, 267. 
Strephona, 227. 
Strepsidura, 218. 
Streptaxis, *289. 
Streptorhynchus, 380. 
Striati, *189. 
Strigilla, 480. 
Strobilus, 294. 
Strombide, *210. 
Strombus, 31, *210. 
Strophalosia, *385. 
Stropheodonta, 381. 
Strophomena, *380. 
Strophostoma, 308. 
Structure of shell, Brachi- 
opoda, 360. 
Struthiolaria, *246. 
Stylina, 241. 
Styliola, 349. 
Stylocheilus, *321. 
Stylopsis, *239. 
Styloptygma, *241. 
Sub-clymenia, 190. 
Sub-generic area, 52. 
Sub-spiral operc., 208. 
Subula, 220. 
Subulina, 292, 
Succinea, *290. 
Suessia, *372. 
Sulco-buccinum, 21S. 
Sunetta, 474, 
Susaria, *323. 
Suture, 180, 206. 
Sycotypus, 217. 
Syncera, *256. 
Syndosmya, *483, 
Synonyms, 48. 
Syrnola, 238. 
Tagelus, 488. 
Tanalia, 247. 
INDEX. 
Tancredia, *457. 
Tanysiphon, *477. 
Tanystoma, *290. 
Taonius, 170. 
Tapes, *475. 
Taste, 18. 
Tebennophorus, 296. 
Tectaria, *252. 
Tecti-branchiata, *312. 
Tectura, 281. 
Tegula, 264. 
Teinotis, *269. 
Tetlina, 458. 
Teilina, *480. 
Tellinide, *479, 
Tellinides, *480. 
Tellinodora, 480. 
Tellinomya, *497. 
Temnocheilus, 189. 
Temperature, 39. 
Tentaculites, *190. 
Tentaculites, 350. 
Terebellum, *212, 
Terebellum, 248. 
Terebra, 55, *220. 
Terebralia, *243. 
Terebratella, *365. 
Terebratula, 19, 38, 357, 
358, *363. 
Terebratulide, *363. 
Terebratulina, *364. 
Terebrirostra, 365. 
Teredina, *507. 
Teredo, 35, 341, *506. 
Tergipes, *335. 
Tertiary shells, 130. 
Testacella, 9, *298. 
Tethys, *333. 
Tetrabranchiata, *178. 
Tetraplodon, 434. 
Teudopsis, *168. 
Teuthide, *167. 
Teuthis, 167. 
Texture of shells, 29. 
Thalassides, 470. 
Thallicera, 259. 
Theca, 190, 346, *349. 
Thecacera, *330. 
Theceurybia, 350. 
Thecidium, 358, *369. 
Thecosomata, *348. 
Thetis, *491. 
Thiara, 246. 
Thoracoceras, *191. 
Thoracoceras, *195. 
Thracia, *495. 
Thyatira, 456. 
Thysanoteuthis, *172. 
Tiara, 231. 
Tichogonia, *423. 
Tiedemannia, *351. 
Tomella, *229. 
Tomigerus, 289. 
Tongue, 287. 
Tonicia, 283. 
Torcula, 248. 
Torinia, *253. 
Tornatella, *313, 
Tornatellide, *312. 
517 
Tornatellina, *294, 
Tornatina, *315. 
Torquilla, 292. 
Toxoceras, *200. 
Trans- Atlantic prov., 85. 
Trapezium, 467. 
Trawling, 139. 
Tredopsis, *289, 
Trematis. *389. 
Tremoctopus, 159, *164, 
Trevelyana, *331. 
Triboniophorus, *297. 
Trichites, 31, *420. 
Trichocyclus, *354. 
Trichotropis, 33, 55, *216. 
Tricolea, 263. 
Tridacna, 13, 35, 55, *452. 
Tridacnide, *451. 
Tridonta, 464. 
Triforis, 37, *242. 
Trigona, *474, 
Trigonella, 375, 477, 484. 
Trigonellites, 182. 
Trigonia, *430. 
Trigoniade, *430. 
Trigonoceras, 194. 
Trigonocelia, 426. 
Trigonosemus, *865. 
Trigonotreta, 371. 
Trigonulina, 472. 
Triomphalia, 506. 
Triopa, *330. 
Tritoceras, *192. 
Triton, 33, 36, 55, 56, *214 
Tritonia, *332. 
Tritoniade, *332. 
Trivia, *233. 
Trochalia, *244, 
 Trochatella, 276. 
Trochatella, *310. 
Trochiscus, 264, 
Trochita, *276. 
Trochoceras, *189. 
Trocholites, 189. 
Trochotoma, *271. 
Trochus, 23, 38, *264. 
Tropeum, 199. 
Trophon, 55, *218. 
Tropidophora, 307. 
Truncatella, 36, #256. 
Tuba, 256. 
Tubular structure, 32, 
Tudora, 307. 
Tugonia, 489. 
Tunicata, 5. 
Turbinella, *216, 
Turbinellus, 31. 
Turbinide, *263, 
Turbo, 23, *263. 
Turbonilla, 239, 
Turcica, 265. 
Turrilites, *200. 
Turris, 228, 231. 
Turritella, 36, *248, 
Turritellidz, *248, 
Turtonia, *459. 
Tyleria, *496. 
Tylodina, *324. 
Tylostoma, *314, 
