INDEX. 



671 



Selachii, 394, 397 ; ch&ractera of, 397. 



Semnopitliecus, 603. 



Sepia, 380, 835. 



Sepiadte, 829, 335, 338. 



Sepiostaire, 326, 329. 



Septa, of Corals, 120, 123; ot the shell of 

 Tetrabranohiate Cephalopods, 327. 331 

 3.32, 333. r . , , 



SeriatoporidcB, 140. 



Serpentarms, 604. 



Serpula, 194. 



Sertularida, 83 ; characters of, 90 ; hydro- 

 thecse of, 90; polypites of, 91; repro- 

 duction of, 91; development of, 92; 

 distribution of, in space and time, 112. 



113. • r , , 



Setae, of Annelides, 188, If 9, 191, 192 

 194. > ' ■ . 



Sharks, 394, 395, 397, 405. 



Sheat-fishes, 385. 



Sheep, 667. 



Shell of MoUusca, 276, 278; of Brachio- 

 poda, 292, 293; ot LamellibrancMata, 

 301; ot Gasteropoda, 311; ot Hetero- 

 poda, 316; of Pteropoda. 320; of Ar- 

 gonauta, 327, 328; of Nautilus, 327, 

 331; of Tetrabranohiate Ceplialopods, 

 332, 333. 



Shrew-mice, 597. 



Shrew-mole, 697, 



Shrikes, 498. 



SisKnsLTig, 605. 



Sigaretus, 318. 



SUicea (Sponges), 67, 69. 



Siluridce, 385. 



Stlurus, 385. 



Simia, 605. 



Sinwsaurus, 448. 



^nwpaUialia, 304, 306, 307. 



SwTwnia, 67, 68. 



SipJumida, 305, 306. 



Siphonophora, 83 ; characters of, 93 ; 

 divisions of, 93-100. 



Siphonops, 409. 



SvpJionostomata (Gasteropoda), 312, 313, 

 317. 



Siphoruitreta, 297. 



Siphons, of Lamellibra/nchiata, 303; of 

 Gasteropoda, 311. 



Siphuncle, of the shell of Nautilus, 327, 

 331, 332; ot Belemnites, 330; of Tetra- 

 branahiata, 332, 333 ; ot Nautilidce, 

 333; of Ammonitidce, 333; of Ortho- 

 ceras, 334. 



Sipwnculacea, 187. 



S^uneuUjidea, 185. 



Siptmeulus, 186. 



Siredon, 411, 412. 



Siren, 410, 411. 



Sirenia, 610, 612,' 615, 517, 622, 524 ; char- 

 acters of, 542-544 ; distribution of, in 

 time, 612. 



Svrenidce, 411. 



Sitta, 499. 



Sivatherium, 566, 615, 618. 



Slaters, 226. 



Stimonia, 284. 



Sloth, 610, 611. 



Snakes, 420, 423, 438, 429, 430, 431. 



Solarium, 818. 



Solaster, 162. 



SoUcurtus, 307. 



Solen, 807. 



Solenidce, 806, 307. 



Solidmngula, 652, 555, 619. 



Solipedm (see Solidungula). 



Solitaire, 492. 



Solpfigidce, 241. 



Somateria, 479. 



Somatic cavity, of Coslenterata, 79; of 



Hydrozoa, 80 ; of Hydra, 84 ; of ^c- 



tinozoa, 114. 

 Somatocyst, 93, 94. 

 Somite, 199; of Crustacea, 203 ; of ^rocA- 



TiMia, 235. 

 Sorex, 597. 

 Soricidai, 597. 

 Soroidea, 67. 



Spatangidce, 150. 



Sjjateiaria, 892. 



Species, definition of, 23 ; origin of, 39, 40. 



.Spermatophores, 325. 



Sjierm-whale, 649, 



Sphcerogastra, 243. 



Sphceroma, 226. 



Sphceronectidie, 91 



SphcBro'zoum, 62. 



Sphagodus, 404. 



Sphargis, 426. 



Spheniscidie, 475'. 



Spheniscus. 476. 



Spicula, of Sponges, 64, 67; of Radio- 

 laria, 61, 62 ; of .icJijiozoa, 121, 126. 



Spider-monkey, 602. 



Spiders, 235, 236, 237, 243. 



5i>iJMa;, 395. 



Spiniferites, 69. 



Spinnerets of Spiders, 244; of Caterpillars, 

 266. 



Spirialis, 321. 



Spirifer, 296. 



SpiHferidce, 296, 298. 



Spirifervaa, 296. 



Spirorbis, 184, 198. 



Spirula, 326, 330, 33S. 



Spirulidoe, 329, 335. 



SpiruUrostra, 335. 



Splanchnoskeleton, 277. 



Spondylus, 306. 



Spongida, 49, 63; skeleton of, 64, 67; 

 sarcoids of, 64, 67 ; aquiferous system 

 of, 65; reproduction of, 66; classifica- 

 tion of, 67; distribution of, in space, 

 68 ; in time; 68 ; affinities of, 69 ; indi- 

 viduality of, 69- 



Sportgilla, 68; reproduction of, 66; sar- 

 coids of, 67. 



Spoon-bill, 483. 



Spoon-worm, 185, 186. 

 ' Spores, of Sponges, 66. 



Bporosac, of Corynida, 86, 88. 



Spring-tails, 250, 268. 



Squalidoe, 897. 



Squamee, ot Aphrodite, 195t 



Squamata (Reptilia), 421. 



Squami/ulina, 67. 



Squids, 322, 329. 



Squilla, 227. 



Squirrel, 591. 



Staggers, of Sheep, 171. 



Star-nosed Mole, 696. 



Btatoblasts, 28, 28S. 



Stawridce, 140. 



