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. 



ilis, 298. 

 ?r, 274. 



ririferidce, 274, 276. 

 nriferina, 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. 



Squamse, 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 (Medusas), 96, 101, 

 105. 



Stem-muscle, of Vorticella, 68. 



Stem ma ta (see Ocelli). 



Stenaster, 157. 



Steneosaurus, 415. 



Stentor, 9, 70, 71. 



Stephanoceros, 173, 175. 



Stephana miadce, 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, of Physophoridce, 93; of Leeches, 

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



Stolons, ofForaminifera, 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. 



Stripidce, 464. 



Stringocephalus, 274. 



Strobila, of Rhizostomidce, 102; of Tceni- 

 ada, 162. 



Strombidw, 255, 291, 294. 



Strombus, 294. 



Strophatosia, 275. 



Strophomena, 274. 



Strophomenidce, 274, 276. 



Struthio, 452. 



Struthonidce, 451. 



Sturgeon, 367, 368. 



Sturionidce, 368, 378. 



Stiirnidce, 460, 461. 



Stylops, 250. 



Sub-brachiata, 362. 



Sub-kingdoms, 14. 



Suchosaurus, 415. 



Suctoria (Infusoria), 66, 71. 



Swcto, 516, 565. 



SwZa, 446. 



Surinam Toad, 390. 



Sws, 517. 



Suspecta(0phidia), 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. 



Tabulae, of Corals, 117. 



Tabulata, 118, 133. 



Tacky petes, 446. 



Teenia, 160, 161, 162, 163, 164. 



Tceniada, 158; characters and develop- 

 ment of, 159-164. 



Talitrus, 212. 



Talpa. 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. 



Tellinidce, 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 Holothuroidea, 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. 



