458 



ANIMAL STUDIES 



Sponges, 33 ; development of the, 35; 

 (illus.), 36; distribution of, 36; 

 various forms of (illus.), 38 ; struct- 

 ure of, 38 ; skeleton of, 40 ; por- 

 tion of wall of (illus ), 40. 



Spontaneous generation, 69. 



Squirrels, 15, 241. 



Starfish (illus.), 151 ; dissection of 

 (illus.), 159. 



Steganopodes, 220. 



Sticklebacks, 173. 



Sting-ray (illus.), 299. 



Strix pratincola, 226. 



Strongylocentrotus purpuratus (il- 

 lus.), 154. 



Sturgeons, 171. 



Struggle for existence, 281 , 283. 



Struthio camelus (illus.), 218. 



Subordinate realms or provinces, 

 445. 



Surroundings, influence of, 37. 



Sus scrofa, 246 ; S. indicus, 246. 



Swallow-tail butterfly, chrysalid of 

 (illus.), 353. 



Swift (illus.), 193, 229. 



Sword-fish, development of (illus.), 

 273. 



Symbiosis, 337. 



Syrphidse, 367. 



TcBniasolium (illus.), 66. 



Tapeworms, 65 (illus.), 66. 



Tarantula-spider (illus.), 146. 



Tardigrada, 279. 



Teleostei, 170. 



Temperature and other conditions, 



6. 



Tenebrio molitor, 28. 

 Tentacles, 44. 

 Teredo, 92. 



Termites (illus.), 137 ; (illus.), 324. 

 Terns, 219. 



Terrapene- Carolina (illus.), 197. 

 Thalessa, 342; T. lunator (illus.), 



344. 



Therioplcctes, 139. 

 Thousand-legs (illus.), 128. 

 Threadworms, 67 (illus.), 68. 

 Three-toed sloth (illus.), 236. 



Toad, metamorphosis of the (illus.), 

 183 ; dissection of (illus.), 188. 



Tomato- worm larva (illus.), 362. 



Trap-door spider (illus.), 147. 



Tree-hopper (illus.), 3b7. 



Tree-toad (illus.), 310. 



Tremex columba, 342; (illus.), 344. 



Trenatodes, 63. 



Trichechus latirostris (illus.), 238. 



Trichina (illus.), 68, 69. 



Tridacna, 89. 



Trinomial names, 19. 



Trochilns colubris, 230. 



True fishes, 164. 



Tuatera (illus.), 207. 



Turdida, 231. 



Turkey-buzzard, 226. 



Turkeys, 224. 



Turtles, 196. 202. 



Tympanuchus americanus, 225. 



Typhlichthys subterraneus (illua.), 

 173. 



Tyrannidoe, 231. 



Ungulata, 245. 



Vria lomvia arra (illus.), 330. 

 Urocyon cinereo-argentatus, 248. 

 Ursus americanus, 246 ; horribilis, 



246. 

 Uiolophus goodei (illus.), 299. 



Vedalia cardinalis, 289. 



Vcdalia*, 289. 



Vermes, 19. 



Vertebrata, 19, 163, 261. 



Vespa (illus.), 327, 328. 



Vesper tilio fuscu*, 242. 



Vestigial organs, 312. 



Vorticella (illus.), 27. 



Volvox minor (illus.), 33, 34 ; V. glo- 



bator (illus.), 34. 

 Vulpes pennsylvanicus, 248. 



Walking-stick insect (illus.), 356. 

 Warning colors, 359. 

 Wasps, 142. 



Water-beetle (illus.), 311. 

 Whales, 242. 

 Wheel-animalcules (illus.), 83. 



