482 



INDEX 



Sharks, 280. 



Shearwaters. 345. 



Sheep-fluke, 138. 



Sheep, Rocky Mt., *383, 397. 



Ship worm, 251. 



Shoveller, 347. 



Shrews, 391. 



Shrimp, 151, 152. 



Silk-worm, anatomy of, *I78. 



Siphonophore, 98. 



Siren, 297, 298. 



Sistrurus, 322. 



Skate, barn-door, 281; common, 280, 



*28l. 



Skates, 280. 

 Skeleton of coral, 105. 

 Skeletons, preparing, 452. 

 Skink,'blue tailed, #317. 

 Skin of toad, structure of, 40. 

 Slipper-animalcule, *35 ; structure 



and life of, 34. 

 Slug, giant yellow, ^252. 

 Slugs, 252, 253. 

 Snake coral, 321. 

 Snake, garter, *32o; life of, 307; 



structure of, 303; gopher, ^322. 

 Snake king, *32i. 

 Snakes, 316. 

 Snails, 252, 253. 

 Snapping-turtle, 314. 

 Snipes, 349. 

 Snowflakes, *358. 

 Snow-goose, 347. 

 Social life. 410. 

 Somateridi 347. 

 Songs of birds. 364. 

 Sora, 349. 



Sound making of orthoptera, 193. 

 Spadefoot, 300. 

 Sparrow, English, dissection of, 



(facing), *327 ; life-history and 



habits of, 335; structure of, 327; 



western chipping, *36o. 

 Sparrow-hawk, 353. 

 Spatula clypeata, 347. 

 Species, defined, 69, 

 Species-extinguishing, 442. 

 Species-forming, 408, 442. 

 Speotyto cunicularia, 353. 

 Sphinx t'/iersis larva, *43i. 

 Sphinx-moth, pen-marked, larva, 



*43L 



Sphyma, 280. 

 Spicules, sponge. 85. 

 Spider and web, *237. 



Spider, crab, '-235; jumping. ^235 

 long-legged, *233; running, *234. 

 running with egg-sac, *234; tri- 

 angle, and web, *238. 



Spider-crab, 154. 



Spiders, 229; hunting, 233; seden- 

 tary, 233; trap-door, 233; wander- 

 ing, 233; wtb weaving, 233. 



Spinnerets of spider, *233. 



Spizella soda Us arizomc, *36o. 



Sponge, commercial, 86 ; fresh- 

 water, 84; glass, *87; skeleton of. 

 88 ; structure of. 88. 



Sponges, 84; calcareous ocean, 8t,; 

 classification of, 91; development 

 and life-history of, 89 ; feeding 

 habits of, 88 ; form and size ol. 

 87; of commerce, 90. 



Spongin, 86. 



Spongilla sp., 84. 



Springtail, American, *i8i. 



Squamata, 312. 316. 



Squid, great, *257. 



Squids,^255, 257. 



Squirrels, 391. 



Starfish, *KK); cross-section of. *H2. 



&tarfishes,~io8, 121. 



Stentor sp., *79- 



Sterna, 345. 



Sterna maxima, 194. 



Sting-ray, 281. 



Stone- fly, *i82. 



Strix pratincola, 353. 



Strongylocentrotus sp., structure of, 



"3- 



Strongvlocentrotiis fr a n c i s c a n it s. 

 *H5, 122; structure of, 115. 



Struggle for existence, 406. 



Strut hio came/us, 342. 



Sub-species, 69. 



Suckers, 283. 



Sucking-bugs, 197. 



Sun animalcule, *78. 



Sunfish, dwarf, 271; golden, dissec- 

 tion of, (facing) *2&3; life of, 270; 

 structure of, 263. 



Supplies, obtaining laboratory, 453. 



Swans, 347. 



Swarming of honey-bee, 219,. 



Swell-fish, 285. 



Swift, common, 316. 



Sword-fish, 285. 



Symbiosis, 155, 413. 



Symmetry, bilateral, 5 ; radial, 108. 



Sy nip drum illoiuin, *I96. 



