556 



INDEX 



Scyphocrinites, 221. 

 Scyphomedusae (Scyphozoa), 213, 



215. 

 Scyphozoa (Scyphomedusae), 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. 



Serpulidae, 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, 8 1 ; 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, 

 225. 



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. 



