INDEX. 



619 



Sarcoids, of Sponges, 61, 64. 



Sarcoptes, 226. 



Sarcorhampus, 466. 



Sarsia, 28, 98. 



Sauria, 409. 



Saurillus, 413. 



Saurobatrachia, 384 (see Urodela). 



Sauropsida, 338, 393. 



Sauropterygia, 416; general characters 

 of, 417 ; distribution of, in time, 418. 



Saururce, 441, 443; characters of, 467; 

 distribution of, in time, 469. 



Saw-fish, 374. 



Saxicava, 286. 



Scalaria, 295. 



Scalpellum, 203. 



Scansores, 443 ; characters of, 457 ; fami- 

 lies of, 457. 



Scaphites, 312, 314. 



Scaphognathite, 196. 



Scincidce, 410. 



Scincus, 411. 



Scissurella, 295. 



Sciuridai, 545. 



Sciurus, 545. 



Sclerenchyma, 115. 



Sclerobasica (Zoantharia), 113 ; divisions 

 of, 116. 



Sclerobasic, corallum, 114, 115, 116. 



Sclerodermata (Zoantharia}, 117 ; divi- 

 sions of, 118. 



Sclerodermic, corallum, 114, 115, 116, 117. 



Sclerogenidce, 363. 



Scolecida, 135 ; characters and divisions 

 of, 158. 



Scolex, 161, 162. 



Scolites, 188. 



Scolopacidce, 450. 



Scolopendra, 232. 



Scomberidce, 363. 



Scorpion, 221, 222. 



Scorpionidce, 227 ; characters of, 227 ; dis- 

 tribution of, in time, 230. 



Scyllcea, 296. 



Scyllaridce, 193. 



Scythrops, 457. 



Sea-anemones, 111, 129. 



Sea-cucumbers, 153. 



Seals, 531, 532. 



Sea-mouse, 186, 189. 



Sea- slugs, 292. 



Sea-spiders, 225. 



Sea-squirts, 8. 



Sea-worms, 177, 181, 185. 



Segmcntal organs, of Leeches, 182; of 

 earth-worm, 183 ; of Errant Annelides, 

 186. 



Selachii, 370 ; characters of, 373. 



Semnopithecus, 556. 



Sepia, 307, 312. 



Sepiadce, 306, 312, 315. 



Sepiostaire, 303, 306. 



Septa, of Corals, 115 ; of the shell of Tet- 

 rabranchiate Cephalopods, 309, 310. 



Seriatoporidce, 134. 



Serpula, 184, 185, 188. 



Sertularida, 79 ; characters of, 86 ; hydro- 

 thecfe of, 86 ; polypites of, 87 ; reproduc- 

 tion of, 87 ; development of, 87 ; distri- 

 bution of, in space and time, 107, 108. 



Setse, of Annelides, 179, 183, 184, 186. 



Sharks, 350, 370, 373, 380. 



Sheat-fishes, 361. 



Sheep, 518, 520, 525. 



Shell, of Brachiopoda, 271 ; of Lamelli- 

 branchiata, 279 ; of Gasteropoda, 289 ; 

 of Heteropoda, 293 ; of Pteropoda, 297 ; 

 of Argonauta, 304 ; of Nautilus, 304 ; 

 of Tetrabranchiate Cephalopods, 309. 



Shrew-mice, 550. 



Shrikes, 462. 



Siamang, 557. 



Sigaretus, 294. 



Silicea (Sponges), 63. 



Siluridce, 361. 



Simia, 557. 



Simosaurus, 418. 



Sinupallialia, 284, 285. 



Siphonia, 65. 



Siphonida, 283, 2S4. 



Siphonophora, 78 ; characters of, 89 ; di- 

 visions of, 89. 



Siphonostomata (Gasteropoda), 290, 291, 

 294, 313. 



Siphonotreta, 275. 



Siphons, of Lamellibranchiata, 281 ; of 

 Gasteropoda, 288. 



Siphuncle, of the shell of Nautilus, 307, 

 308, 309 ; of Belemnites, 307 ; of Tetra- 

 branchiata, 309; of Nautilidw, 309; of 

 Ammonitidce. 310 ; of Orthoceras, 311. 



Sipunculacea, 179. 



Sipunculoidea,' 177. 



Sipunculus, 178. 



Siredon, 385, 386. 



Siren, 385, 395, 



Sirenia, 472, 473, 477, 484, 486 ; charac- 

 ters of, 502 ; distribution of, in time, 564. 



Sirenidce, 385. 



Sitta, 462. 



Sivatherium, 524, 565, 569. 



Slimonia, 220. 



Sloth, 472, 486, 498, 499. 



Snakes, 397, 402, 403, 404, 405, 407. 



Solarium, 295. 



Solaster, 146. 



Solecurtus, 285. 



Solen, 285. 



Solenidce, 284, 285. 



Solidungula, 511, 512, 515, 565. 



Solipedia (see Solidungula}. 



Solitaire, 456. 



Solpugidce, 227. 



Somatic cavity, of Ccelenterata, 74, 75; of 

 Eydrozoa, 76 ; of Hydra, 80 ; of Actin- 

 ozoa, 109. 



Somatocyst, 89. 



Somite, 190; of Crustacea, 194; of Arach- 

 nida, 221. 



Sorex, 550. 



Soricidce, 550. 



Soroidea, 54. 



Sparsispongia, 64. 



Spatangidce, 144. 



Spatularia, 368. 



Species, definition of, 19 ; origin of, 37-39. 



Spermatophores, 302. 



Sperm-whale, 505, 509. 



Sphceroma, 213. 



Sphceronectidce, 92. 



Sphcerozoum, 59. 

 yhagodus, 379. 

 ohargis, 401. 

 " -.niscidce. 444. 



