556 



INDEX 



Scyphocrinites, 221. 

 Scyphomedusae (Scyphozoa), 213, 

 ^ 215. 

 Scyphozoa (Scyphomedusse), 213, 



215; 



Sea, life of the, 472-478. 



Sea anemones ; see Coelenterata. 



Sea cucumbers ; see Synapta. 



Sea squirt; see Tunicata (Ascidians). 



Sea urchins ; see Echinus. 



Seabright bantam, 87. 



Seals ; see Pinnipedia. 



Seaweeds ; see Algae. 



Secretions, 20, 30. 



Sedgwick, Adam, 149. 



Selection, natural, 129-136, 502- 

 506; Darwinian theory, 132; 

 determiners, 134; life-length, and 

 checks on, 129; Mendelism, 133; 

 natural vs. man's, 132; struggle 

 for existence, 131; survival of 

 fittest, 131; types, 134; varia- 

 tions, 135; see also Darwin; 

 Eugenics ; Evolution ; Genera- 

 tion; Mendel; Mendelism. 



Semigigas, 64. 



Semitropical Area, 461. 



Septa, 251. 



Serignan, festival of, 284. 



Serpulidas, 239. 



Serum, 26, 30. 



Sex, 77-88; characters, primary and 

 secondary, 78; conjugation, 80; 

 determinators of, 81, 86; dimor- 

 phism, 312; gynandromorphs, 85 ; 

 hermaphrodites, 78; limitation of, 

 84; linkage, 84; monstrosities, 

 38; selection, 129-136, 502-506; 

 twins, 87; two sexes, 77; varia- 

 tions in life by, 81; see also 

 Selection. 



Shaler, N. S., 516. 



Sharp, D., 279. 



Siamese twins, 38. 



Silkworm disease and cure, 484. 



Silurian Period, 148, 150, 253. 



Silvestri, 268. 



Simiidae, 410; Simia satyrus, 410. 



Sinus venosus, 338. 



Siphonaptera, 278. 

 Siphunculata, 272. 

 Sipunculoidea, 181. 

 Siren, 360. 

 Sirenia, 414. 



Skeleton (Endoskeleton), of verte- 

 bra ta, 328. 

 Skull, 329-330. 

 Smith, Frank, 242. 

 Smith, J. B., 279. 

 Snails (Gastropoda), 78, 142. 

 Snakes (Ophidia), 364, 372. 

 Sociology vs. biology, 530-534. 

 Solenodon, 399. 

 Sonoran Areas, 459, 460, 461. 

 Soothsayers ; see Mantidae. 

 Spallanzani, 483. 

 Sparrows ; see Passeriformes. 

 Specialization, 99. 

 Species, 170. 

 Species plantarum, 174. 

 Spermatogenesis, 67. 

 Spermatocyte, 66, 67. 

 Spermatozoon, 66. 

 Sphargis, 368. 

 Sphenisciformes, 381. 

 Sphenodon (Tuatera), 365, 452. 

 Spiders; see Arachnida. 

 Spillman, W. J., 198. 

 Spilochalcis mariae, 275. 

 Spinal cord, 329, 334. 

 Spiracles, 36. 

 Spirorbis, 239. 



Spizella monticola ochracea, 395. 

 Sponges (Porifera), 180, 207-209, 



, 22S '. 

 Spongin, 209. 



Spontaneous generation, 483 ; see 



also Generation. 

 Sporangium, 189, 190. 

 Sporophore, 190. 

 Sporozoa, 190-191, 201, 202. 

 Sport, 119. 



Springtails ; see Collembola. 

 Spruce, Richard, 466. 

 Spumaria, 189. 

 Stamens, 77. 



Starfish (Asteroidea), 218, 222 

 Statoliths, 214, 215. 



