Solenogastres, 321. 
Solenomya, 405, 423. 
S. borealis, 405, 423. 
S. velum, 405, 423. 
Solenomyide, 405, 423. 
Somite, 243. 
Sow-bugs, 2gr. 
Spatangoide, 217, 226. 
Spatangoidea, 217, 226. 
Species, 20. 
Specific name, 28, 
Sphacelaria, 62, 65. 
S. cirrhosa, 62, 65. 
S. radicans, 62, 65. 
Sphacelariacez, 62, 65. 
Sphzoplea annulina, 37. 
Spheeridia, 219. 
Sphzrococcee, 77, 84. 
Sphzroma, 242, 293. 
S. destructor, 293. 
S. quadridentatur, 24°, 
. 293- 
Spicules, 102. 
Spider-crabs, 241, 284. 
Spines, 201, 205, 221. 
Spionide, 161, 181. 
Spire, 304. 
Spirorbis, 8, 12, 162, 185. 
S. borealis, 162, 185. 
Spirula, 464, 467, 468. 
Spirulina, 48, 49. 
Sponges, 100, ror. 
Spongia, 104. 
S. graminea, 10g. 
Spongide, 100. 
Spongillidz, 104. 
Spongin, ro2. 
Spring-tides, 13, 15. 
Spyridia, 78, g2. 
S. filamentosa, 78, 92. 
Squamariez, 78, 95. 
Squame, 243. 
Squids, 464. 
Sguilla, 241, 288. 
S. empusa, 241, 288. 
Starfishes, 43, 114, 200, 203, 204, 
205, 434. 
Station and habits of the Mol- 
lusea, 313. 
Stauromeduse, 133, 136. 
Stelospongine, 100. 
Sternogramme, 76, 82. 
S. interrupta, 76, 82. 
Sternorhynchus, 241, 286. 
S. sagittarius, 241, 286. 
Stomatopoda, 241, 288. 
Stone-canal, 201, 203. 
Stone-crab, 280. 
Stony corals, 112, 115, 146. 
Striz, 344. 
Strobila, 135, 138. 
Strombidz, 326, 375. 
Strombus, 10, 311, 326, 376. 
S. alatus, 376. 
S. gigas, 326, 376, 431. 
S. pugilis, 326, 376. 
Strongylocentrotus, 217, 223. 
S. drobachiensis, 41, 43, 
217, 223. 
S. franciscanus, 217, 223. 
S. purpuratus, 217, 221, 
223. 
Structure of mollusks, 315. 
INDEX 
Stylochopsis, 160, 166. 
S. littoralis, 160, 166. 
Suberites, 100, 106. 
S. compacta, 100, 106. 
Suberitidz, 100. 
Suborders, 29. 
Subumbrella, 120. 
Suckers, 201, 203. 
Sun-jellies, 134, 138. 
Suture, 304, 344. = 
Swimming-bell, 120. 
Swimming crabs, 241. 
Syconidz, 100. 
Syllida, 161, 173. 
Symmetry, 328. 
Synapta, 228, 229, 233. 
S. roseola, 228, 233. 
S. rotifera, 228, 233. 
S. tenuis, 228, 233. 
S. viviparia, 231. 
T 
Table: Classification of algw— 
Blue-green, 48. 
Brown, 62. 
Grass-green, 51. 
Red, 76. 
Classification of— 
Actinozoa, 141. 
Arthropoda, 238. 
Asteroidea, 204. 
Cephalopoda, 464. 
Chordata, 472. 
Ctenophora, 154. 
Echinoidea, 217. 
Holothuroidea, 228. 
Hydrozoa, 116. 
Mollusca, 300. 
Molluscoida, 188. 
Ophiuroidea, 213. 
Pelecypoda, 409. 
Porifera, 100. 
Scyphozoa, 133. 
Tagelus, 310, 407, 459. 
T. gibbus, 407, 459. 
Talitrus longicornis, 289. 
Talorchestia, 242, 289. 
T. longicornis, 242, 289. 
T. megalophthalma, 290. 
Taonia, 63, 71. 
T. atomaria, 63, 71. 
Tapes, 406, 451. 
T. laciniata, 406, 451. 
T. staminea, 406, 451. 
Tealia crassiformis, 145. 
Tectarius, 311, 326, 373. 
T. muricatus, 326, 
T. nodulosus, 326, 373. 
Tectibranchiata, 300, 324, 350. 
Tedania, 100, 107. 
Teeth, 304, 417, 418. 
Cardinal, 418. 
Lateral, 418. 
Tellina, 311, 406, 443. 
T. alternata, 406, 444. 
T. bodegensis, 406, 444. 
T. radiata, 406, 443, 444. 
T. tenera, 406, 444. 
Tellinidz, 406, 443. 
Telson, 243, 247. 
Tentaculocysts, 195. 
489 
Terebellide, 161, 182. 
Teredinidz, 407, 462. 
Teredo, 407, 462. 
T. navalis, 13, 407, 462. 
Terga, 254. 
Terms used in describing Crus- 
tacea, 243. 
Echinoderms, 201. 
Hydroids, 118. 
Mollusks, 302. 
Polyzoa, Igo. 
Testaceous, 304. 
Tetrabranchiata, 
67. 
Tetrastemma, 160, 169. 
T. arenicola, 160, 169. 
Thalassiophyllum, 36, 63, 70. 
Thaliacea, 472. 
Thallophytes, 25. 
Thallus, 26. 
Thelepsus, 161, 182. 
T. cincinnatus, 161, 182. 
Thorax, 243, 246. 
Thracia, 309. 
Thyone, 228, 231. 
T. briareus, 228, 231. 
Tima, 128. 
T. formosa, 116, 128. 
Tivela, 406, 410, 450. 
T. crassatelloides, 406, 450. 
Toad-crab, 285. 
Toxopneustes, 217, 224. 
T. variegatus, 217, 224. 
Trachyline, 117, 120, 128. 
Trachymeduse, 117, 128. 
Trachynema, 128, 
T. digitale, 117, 128. 
Transatlantic province, 309. 
Trematoda, 160, 
Trichodesmium, 33. 
Trichotropis, 309. 
Tricladida, 160, 166. 
Triclads, 166. 
Tridacna gigas, 313, 419. 
Triforis, 374. 
Tritonidea, 327, 394. 
T. tincta, 327, 394. 
Trivia, 326, 378. 
T. californica, 326, 379. 
T. pediculus, 326, 378. 
T. quadripunctata, 326,379. 
T. solandri, 326, 379. 
T. spadacea, 379. 
Trochide, 325, 359. 
Trochiscus, 325, 362. 
T. norrisi, 325, 362. 
Trophon, 409, 326, 383. 
T. clathratus, 326, 383. 
Tube-feet, 203. 
Tubicola, 161, 172. 
Tubicolous worms, 180. 
Tubipora, 141, 147, 151. 
Tubularia, 116. 
T. Couthouyi, 116, 123. 
T. indivisa, 116. 
Tubularians, 116, 121, 122. 
Tubulipora, 188, 194. 
T. flabellaris, 188, 194. 
Tunicata, 472. 474. 
Tunicates, 474. 
Turbellaria, 160, 165. 
Turbinate, 304. 
Turbinellidz, 327, 394. 
301, 464, 
