INDEX. 



411 



Skin of Invertebrates, 127. 



" of Vertebrates, 128. 

 Skull, 141. 

 Slater, 284, 251. 

 Slug, 2T4, 232. 

 Smell, 17T. 

 Snail, 272. 



" alimentary canal of, SO, 45. 



" anatomy of, 45. 



" circulation in, 106, 45. 



" eye of, 181, 154. 



" gills of, 113. 



" gizzard of, 64. 



" heart of, 45. 



" jaw of, 56, 20. 



" larva of, 176. 



" locomotion of, 161. 



" lung of, 116, 274, 45. 



" mode of feeding, 52. 



" mouth of, 56. 



" nervous system of, 168, 134, 154. 



" operculum of, 114, 134, 228. 



" respiration in, 116, 45, 228. 



" shell of, 133, 100, 228, 233-246. 



tk siphon of, 228. 



" smell of, 178. 



" teeth of, 65, 29. 



" tentacles of, 176, 154, 228. 



" see Gasteropoda. 

 Snake, 320, 298, 299. 



'* deglutition of, 73. 



" locomotion of, 162. 



" lungs of, 119, 84. 



" poison apparatus of, 68, 33. 



" scales of, 135. 



" skull of, 37. 



" stomach of, 82. 



" tongue of, 61. 



" Vertebrae of, 140. 



" voice of, 1S9. 



" see Boa, Ophidia, Reptilia. 

 Snapping-bug, 299. 

 Snipe, 332. 

 Solaster, 260. 

 Somite, 392. 

 Songsters, 338. 

 Sorex, 346, 338. 

 Sow-bug, 285. 

 Sparrow, 339. 

 Species, denned, 235. 



" number of, 221. 

 Sperm-whale, see Whale. 

 Sphinx-moth, 303, 43. 

 Spider, classification of, 289, 260. 



" alimentary canal of, 79. 



" appendages of, 25. 



" circulation in, 106. 



" fangs of, 53, 18, 25. 



" mouth of, 60, 25. 



" respiration in, 116. 



" spinnerets of, 289, 25, 261. 



Spider, web of, 289, 260. 

 Spinal column, 140. 



" cord, 175. 

 Spinneret of Spider, 289, 261. 



of Caterpillar, 301, 276. 

 Spiracle, 114, 79. 

 Spongida, 244, 189, 190. 



" alimentary canal of, 76. 

 " anatomy of, 189. 

 egg of, 194, 163. 

 feeding of, 50, 189. 

 ** respiration in, 112. 

 skeleton of, 129, 190. 

 Squash-bug, 297. 

 Squid, 280. 



" locomotion of, 158. 

 " see Cuttlefish. 

 Squirrel, 346. 

 Stag, 352, 345. 



Star-fish, alimentary canal of, 76, 126. 



" anatomy of, 126. 



" circulation in, 105, 126. 



" classification of, 258. 



" development of, 208. 



" digestion in, 92. 



" locomotion of, 161, 126- 



" metamorphosis of, 207. 

 mode of feeding of, 51. 



" mouth of, 56. 



" nervous system of, 168, 133. 



" respiration in, 112. 



" see Echinodermata. 

 Stilt, 332. 

 Stomach, 82-89. 



" digestion in, 93. 

 Stork, 332. 

 Stridulation, 188. 

 Strom bus, 278, 243. 

 Struggle for Life, 226. 

 Struthio, 327, 305. 

 Sturgeon, 315, 290. 

 Subkingdom, 233. 

 Sun-fish, 247. 

 Sun-star, 260. 

 Survival of Fittest, 226. 

 Suture, 147. 

 Swallow, 340, 328. 

 Swan, 331. 

 Swift, 335. 

 Swimmeret, 282. 

 Symmetry, 222. 



Sympathetic nervous system, 175, 146. 

 Synovia, 147. 



Taenia, see Tape-worm. 

 Tanager, 339. 

 Tapetum, 1S4. 

 Tape-worm, 264, 216. 



" feeding of, 49. 

 Tapir, 63, 351. 

 Taste, 177. 



