372 



Index. 



Sharks, 168, 169. 



Shedding of horns, 273. 



Sheep, 270. 



Shell of sea urchin, 339. 



Shipworm, 123. 



Shore birds, 230. 



Shrews, 264. 



Shrike, 240. 



Shrimp, 77. 



Silica, 299. 



Siliceous earth, 299. 



Sponges, 309. 

 Silkworm, 30. 

 Silvertip bear, 281. 

 Sinus, blood, of crayfish, 69. 

 Siphon of squid, 140. 



Of clam, 105, 108. 

 Siren, 190. 

 Skate, 169, 170. 

 Skeleton of arthropods, 86. 



Of birds, 245. 



Of bony fishes, 170. 



Of insects, 52. 



Of pigeon, 208, 213. 



Of sea urchin, 338. 



Of shark, 168. 



Of sponge, 308. 



Of starfish, 331. 

 Skin of earthworm, 90. 

 Skipjacks, 41. 

 Skippers, 35. 

 Skunk, 282. 

 Slaves of ants, 51. 

 Slipper animalcule, 291. 

 Sloths, 259. 

 Slugs, 132. 



Sea, 135. 

 Smell in birds, 217. 



In crayfish, 72. 



In deer, 277. 



In rabbit, 255. 



In snails, 130. 

 Smelling patches, 130. 

 Smelt, 165. 

 Snails, land, 131. 



Pond, 133. 



River, 134. 



Sea, 135. 



Shell, 127. 

 Snake doctors, 14. 



Snake feeders, 14. 

 Snakes, 199, 205. 



Brain, 285. 



Poisonous, 203, 204. 

 Snipe, 230. 

 Snout beetles, 41. 

 Social bees, 49. 

 Sole, 176. 



Solid-horned ruminants, 273. 

 Solitary bees, 49. 

 Sowbug, 84. 

 Spanish fly, 41. 

 Sparrows, 239. 



Brain, 285. 



English, 239. 

 Specialization, 304. 

 Speech, 282. 

 Sperm cells of hydra, 317. 



Of sponge, 311. 

 Spermary offish, 162. 



Of hydra, 314, 317. 



Sea urchin, 341. 

 Sperms of hydra, 317. 



Of jellyfish, 323. 



Of medusa, 322. 



Of sponges, 311. 

 Sphinx moth, 28' 

 Spicules of sponge, 307, 308, 309. 

 Spiders, 55. 



Jumping, 56. 



Trapdoor, 59. 



Web, 57. 

 Spinal bulb, 285. 



Cord, 285. 

 Spindles, 14. 

 Spines of sea urchin, 338, 339. 



Of starfish, 331. 



Of sting cells, 315. 

 Spinnerets of spider, 57. 

 Spinning of spiders, 56. 

 Spiny-rayed fish, 171. 

 Spiracles, 5. 

 Spleen of snake, 201. 

 Sponges, 307. 



Calcareous, 308. 



Commercial, 309,310. 



Development of, 311. 



Flagella, 307, 308. 



Fresh-water, 310. 



Horny, 309. 



