620 



INDEX. 



Spicula, of Sponges, 60, 63; of Radiolaria, 

 58, 60; ofActinozoa, 115, 121. 



Spider-monkey, 555. 



Spiders, 228, 229, 230. 



Spinax, 371. 



Spiniferites, 65. 



Spinnerets of Spiders, 229 ; of Caterpillars, 

 248. 



Spirialis, 298. 



Spirifer, 274. 



Spiriferidce, 274, 276. 



Spiriferina, 274. 



Spirorbis, 185, 188. 



Spirula, 303, 306, 312. 



Spirulidce, 306. 



Spirulirostra, 312. 



Splanchnoskeleton, 303. 



Spondylus, 284. 



Spongida, 60-65 ; skeleton of, 60 ; sarcoids 

 of, 61 ; aquiferous system of, 61 ; repro- 

 duction of, 62 ; classification of, 63 ; dis- 

 tribution of, in space, 64; in time, 64; 

 affinities of, 65 ; individuality of, 65. 



Spongilla, 47 ; reproduction of, 62, 63 ; 

 sarcoids of, 64. 



Spoon-bill, 450. 



Spoon-worm, 177, 178. 



Spores, of Sponges, 63. 



Sporosac, of Corynida, 82. 



Spring-tails, 242. 



Squamae, of Aphrodite, 186. 



Squamata (Reptilia), 395. 



Squids, 304, 306. 



Squilla, 214. 



Squirrel, 545. 



Staggers, of Sheep, 163. 



Statoblasts, 26, 264. 



Stauridce, 134. 



Stauridia, 84. 



Steganodictyum, 65. 



Steganophthalmata (Medusae), 96, 101, 

 105. 



Stem-muscle, of Vorticella, 68. 



Stemmata (see Ocelli). 



Stenaster, 157. 



Steneosaurus, 415. 



Stentor, 9, 70, 71. 



Stephanoceros, 173, 175. 



Stephanomiadce, 94. 



Sterelmintha, 165. 



Stereognathus, 560, 561. 



Sternaspis, 178. 



Sternoptixince, 361. 



Sternum, of Crustacea, 194 ; of Arach- 

 nida, 221 ; of Chelonia, 399 ; of Aves, 

 428 ; of Mammalia, 474. 



Stichostega, 54. 



Stigmata. ofPhysophoridce,Q3; of Leeches, 

 182; of Arachnida, 224; of Insecta, 238. 



Stolons, of Foraminifera, 52; of composite 

 Actinozoa, 118; of social Tunicata, 255. 



Stomapoda, 198; characters of, 214; dis- 

 tribution of, in time, 220. 



Stomatodendra, 104. 



Stork, 449. 



Strepsiptera, 251. 



Strepsirhina, 552, 553. 



Streptospondylus, 415. 



Strigidce, 464. 



Stringocephalus, 274. 



Strobila, of Rhizostomidce, 102 ; of Tceni- 

 ada, 162. 



Strombidce, 255, 291, 294. 



Strombus, 294. 



Strophalosia, 275. 



Strophomena, 274. 



Strophomenidce, 274, 276. 



Struthio, 452. 



Struthonidce, 451. 



Sturgeon, 367, 368. 



Sturionidce, 368, 378. 



Sturnidce, 460, 461. 



Stylops, 250. 



Sub-brachiata, 362. 



Sub-kingdoms, 14. 



Suchosaurus, 415. 



Suctoria (Infusoria), 66, 71. 



Swcto, 516, 565. 



SWa, 446. 



Surinam Toad, 390. 



SMS, 517. 



Suspecta (Ophidia), 406. 



Swallow, 463. 



Swarm-spores, of Sponges, 63. 



Swifts, 463. 



Swim-bladder, of Fishes, 351. 



Swimmerets, of Lobster, 195, 196, 216. 



Swimming-bells, 90. 



Sylviadce, 461, 462. 



Synapta, 155. 



Synapticulse, 118. 



Synaptidce, 153, 155. 



Syndactyli, 463. 



Syndendrium, 104. 



Syngnathidce, 364. 



Syrinx, 178. 



Tabanidce, 247. 



Tabulse, of Corals, 117. 



Tabulata, 118, 133. 



T achy petes, 446. 



Tcenia, 160, 161, 162, 163, 164. 



Tceniada, JOI ; characters and develop- 

 ment of, M2-1&4 



Talitrus, 2l!P 



TWpa. 550. 



Talpidce, 550. 



Tank-worms, 171. 



Tantalince, 449. 



Tape-worm, 159, 160, 161, 162, 163, 164. 



Tapir, 513, 514. 



Tapiridce, 514. 



Tardigrada, 224, 225. 



Tectibranchiata, 292, 296. 



Teleosaurus, 415. 



Teleostei, characters of, 357-360 ; sub- 

 divisions of, 360-364 ; distribution of, in 

 time, 378, 380. 



Tellina, 285. 



Telllnidce, 285. 



Telson, of Crustacea, 192 ; of Lobster, 194 ; 

 of Limulus, 209 ; of Scorpion, 227. 



Tentacles, of Hydra, 80 ; of Calycophoridce, 

 90 ; of Physophoridce, 93 ; of Medusidce, 

 96 ; , of Hydra-tuba, 101 ; of Actinia, 

 112; of Alcyonaria, 119; of Pleuro- 

 brachia, 125 ; of Holothirroidea, 154 ; of 

 Polyzoa, 258, 262; of Tunicata, 267; 

 of Cuttle-fishes, 300, 306. 



Tentaculites, 188, 313. 



Tenthredinidce, 249, 



Tenuirostres, 460, 462. 



Terebella, 185 ; development of, 184. 



Trebratella, 274. 



