432 



INDEX. 



Sight, of Ccelenteraies, 180. 

 " of Mollusks, 181. 

 " of Vertebrates, 183. 

 Silk-gland, 40. 

 Silk-worm, 303. 

 Simia, 357, 363, 355, 356. 

 Sinuses, 138. 

 Siphon, 113,226. 

 Siphonophora, 248, 194. 

 Siphuucle, 279, 247. 

 Sirenia, 349, 73, 843. 

 " see Dugout. 

 Size of Animals, 221. 

 Skeleton, of Arthropods, 131. 

 " of Birds, 144, 116. 

 " of Ccelenterates, 130. 

 " of Crocodile, 113. 

 " of Echinoderms, 130. 

 " of Fish, 138, 144, 145, 112. 

 " of limbs, 146. 

 " Lion, 139, 106. 

 " Mammals, 139, 106, 114, 117- 



120. 



Mollnsks, 133. 

 Reptiles, 118, 115. 

 " of skull, 141, 108-111. 

 " of Tortoise, 115. 

 " of Vertebrates, 134. 

 of Vulture, 116. 

 of Whale, 114. 

 " see Exoskeleton. 

 Skin of Invertebrates, 127. 



" of Vertebrates, 128. 

 Skin-muscle, 156. 

 Skull, 141, 87, 108-111, 353, 354, 359, 



360. 



Slater, 286, 251. 

 Slug, 275, 232. 

 Smell, 177. 

 Snail, 272. 



" alimentary canal of, 80, 45. 

 " anatomy of, 45. 



circulation in, IOC, 46. 



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, 184, 154. 



operculnm of, 114, 134, 228. 



respiration in, 116, 45. 



shell of, 133, 100, 228, 231-246. 



siphon of, 228. 



smell of, 178. 



teeth of, 65, 29. 



tentacles of, 176, 164, 228. 



a 



Snail, see Gasteropoda. 

 Snake, 320, 65, 298, 299. 

 " deglutition of, 73. 

 " locomotion of, 162. 

 " lungs of, llfl, 84 

 " poison apparatus of. 68, 83. 

 " scales of, 135. 

 14 skull of, 37. 

 " stomach of, 82. 

 " tongue of, 62. 

 " Vertebrae of, 140. 

 voice of, 189. 

 " see Boa, Ophidia, Reptiha. 

 Snapping-bug, 299. 

 Snipe, 332. 

 Solaster, 260. 

 Somite, 392. 

 Songsters, 338. 

 Sorex, 340, 338. 

 Sow-bug, 286. 

 Sparrow, 339. 

 Species, defined, 235. 



number of, 221. 

 Sperm-cells, 196. 

 Sperm-whale, ttee Whale. 

 Sphinx-moth, 303, 43, 136. 

 Spider, classification of, 289, 260. 

 alimentary canal <>f, 79. 

 appendages of, 102, 25. 

 circulation in, 106. 

 fangs of, 53, 18, 25. 

 mouth of, 60, 25. 

 respiration in, 116. 

 spinnerets of, '2S9, 25, 26i. 

 web of, 289, 260. 

 Spinal column, 141. 



cord, 175, 137. 

 Spindle-shell, 236. 

 Spinneret of Spider, 289, 25, 261. 

 of Caterpillar, 301, 276. 

 Spiracle, 114, 293, 79. 

 Splint-bone, 147. 

 Sponge, 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 Cuttle-fish. 

 Squirrel, 346. 

 Stag, 352, 345. 

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



210. 



" anatomy of, 126. 

 " circulation in, 105. 

 " classification of, 258. 

 " development of, 208. 



