432 



INDEX. 



Sight, of Cceleiiterates, 180. 

 " of Molliiske, 181. 

 " of Vei-tebriitee, 1S3. 

 Silk-gliuid, 40. 

 Silli-woi-m, 303. 

 Simia, 3I>7, S63, 365, 35& 

 Sinuses, 138. 

 Siphon, 113, 226. 

 Siphouophura, 248, 194. 

 Sipliuucle, 2T9, 247. 

 Sitenia, 349, 73, 343. 

 " see Dugon*?. 

 Size of Animals, 221. 

 Slseleton, of Arthropoda, 131. 

 " of Birds, 144, 116. 

 " of Cceleiiterates, 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, 113. 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, 37, 108-111, 358, 354, 869, 



860. 

 Slater, 286, 261. 

 Sing, 275, 282. 

 Smell, 177. 

 Snail, 272. 



" alimentary canal of, 80, 45. 



" anatomy of, 45. 



*' circulation in, 106, 46. 



" eye of, 181, 154. 



" gills of, 118. 



" gizzard of, 64. 



" heart of, 45. 



" jaw of, 50, 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. 



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



" siphon of, 228. 



" smell of, 178. 



" teeth of, 65, 29. 



" tentacles of, 176, 154, 228. 



Snail, see Gasteropoda. 

 Snake, 320, 65, 298, 299. 



" deglutition of; 73. 



" locomotion of, 162. 



" Inngs of, 119, 84. 



** poison apparatus of, 68, 38. 



" scales of, 135.' 



" skull of, 37. 



" stomach of, S3. 



" tongue of, 62. 



" Vertebrae of, 140. 



" voice of, 189. 



" 8ee Boa, Ophidia, Eeptiha. 

 Snappiug-bng, 299. 

 Snipe, 332. 

 Solaster, 260. 

 Somite, 892. 

 Songsters, 338. 

 Sorex, 346, 338. 

 Sow-bug, 286. 

 Sparrow, 339. 

 Species, defined, 235. 



** number of, 221. 

 Sperm-cells, 196. 

 Spenn-whale, see Whale. 

 Sphinx-moth, 303, 43, 136. 

 Spider, classification of, 289, 260. 



" alimentary canal of, 79. 



*' appendages of, 162, 25. 



" circulation in, 106. 



" fangs of, 53, 18, 25. 



" month of, 60, 25. 



" respiration in, 116. 



" spinnerets of, 289, 25, 261. 



" web of, 289, 260. 

 Spinal column, 141. 



" cord, 175, 187. 

 Spiudlc-shell, 236. 

 Spinneret of Spider, 289, 26, 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, 168. 



" feeding of, 60, 189. 



" respiration in, 112. 



" skeleton of, 129, 190. 

 Squash-bug, 297. 

 Sqnid, 280. 



" locomotion of, 158. 

 " see Cuttle-fish. 

 Squirrel, 346. 

 Stag, 352, 345. 



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

 210. 



" anatomy of, 126. 



" circulation in, 105. 



■ " classiflcation of, 258. 



" development of, 208. 



