410 INDEX. 
Retina, 183,158. 
Rhea, 327. 
Rhinoceros, 351, 344. 
Rhizopoda, 240, 15, 185,186. 
“ skeleton of, 129. 
Rodentia, 345, 335, 336, 337. 
“ teeth of, 71, 335. 
Rotifera, 260, 219. 
“ jaws of, 64. 
Rudimentary Organs, 207. 
Ruminantia, 351. 
“ stomach of, SS, 56. 
“ see Ox, Ungulaia. 
Salamander, 31S, 296. 
“ metamorphosis of, 174. 
Saliva, function of, 93. 
Salivary Glands, 122. 
Salmon, 316, 285. 
Sand-flea, 284, 252. 
Sandpiper, 332, 312. 
Sarcolemma, 39, 204. 
Sauropsida, 309. 
Saururse, 394. 
Scales of Butterflies, 301, 272. 
“ of Fishes and Reptiles,135,102,283. 
Scallop, eye of, 181, 153. 
“ shell of, 272. 
Scapular Arch, 146. 
Scarabseus, 299. 
Scarf-skin, 128. 
Sclerobase, 129. 
Scleroderm, 129. 
Sclerotic, 183. 
Scolopendra, 291, 259. 
Scorpion, 28S, 259. 
“ mouth of, 60. 
“ respiration in, 116. 
Sea-anemone, see Polyp. 
Sea-blubber, 247. 
Sea-butterfly, 273, 229. 
Sea-fan, 256, 208. 
Sea-hare, 274. 
Seal, 355, 128. 
Sea-lemon, 274. 
Sea-lily, 25S, 211. 
Sea-lion, 355, 350. 
Sea-slug, 274. 
Sea-urchin, 262, 214. 
“ absorption by, 94. 
“ alimentary canal of, 76, 39. 
“ anatomy of, 39. 
“ circulation in, 105. 
“ digestion iu, 92. 
“ growth of, 214. 
“ mode of feeding, 52. 
“ mouth of, 56. 
“ respiration in, 112. 
“ shell of, 28. 
“ skeleton of, 130, 96. 
“ spines of, 130, 97. 
Sea-urchin, teeth of, 64, 28. 
Sea-worm, 268, 17, 223. 
Secretion, 121. 
“ see Gland. 
Segmentation of egg, 197, 16b. 
Self-division, 191, 100. 
Sensation, 176. 
Sense of hearing, 178. 
“ of sight, ISO. 
“ of smell, 177. 
“ of taste, 177. 
“ of touch, 176. 
Sense-organs, see Sense. 
“ development of, 264. 
Sensibility, 176. 
Sepia, 2S0, 248. 
Serpent, see Snake. 
Sertularia, 247, 192. 
Serum, 98. 
Setae, 269. 
Setophaga, 340, 325. 
Seventeen-year locust, 297, 26o. 
Shark, 314, 287. 
“ eggs of, 194, 164. 
“ gills of, 114, 287. 
“ skeleton of, 137, 145. 
Shells of Crustacea, 131. 
“ of Echinoderms, 130. 
“ of Mollusks, 133. 
Shoulder-girdle, 146. 
Shrew, 63, 346, 338. 
Shrimp, 286. 
Sight, of Arthropods, 181. 
“ of Ccelenterates, 180. 
“ of Mollusks, 181. 
“ of Vertebrates, 1S2. 
Silk-gland, 40. 
Silk-worm, 303. 
Simia, 35S, 353,. 355. 
Sinuses, 13S. 
Siphouophora, 248, 194. 
Siphuncle, 279, 247. 
Siren, 318. 
Sirenia, 349, 73, 343. 
“ see Dugong. 
Size of Animals, 221. 
Skeleton, of Arthropoda, 131. 
of Birds, 116, 144. 
“ of Ccelenterates, 130. 
“ of Echinoderms, 130. 
“ of Fish, 138, 144, 11‘A 
“ of limbs, 146. 
“ Lion, 139, 116. 
“ Mammals, 139, 106, 114, 11V 
120 . 
“ Mollusks, 133. 
“ Reptiles, 113, 115. 
“ of skull, 141, 108, 111. 
“ of Vertebrates, 13a 
“ of Whale, 114. 
“ see Exoskeleton. 
