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 purpuratu* (il- 

 lus.), 154. 



Sturgeons, 171. 



Struggle for existence, 381, 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. 



Tceniasolium (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. 



Terr apene- Carolina (illus.), 197. 

 2'halessa, 342 ; T. lunator (illus.). 



844. 



Therioplcctes, 189. 

 Thousand-legs (illua.), 128. 

 Threadworms, 67 (illus.), 68. 

 Three-toed sloth (illus.), 236. 



Toad, metamorphosis of the 

 183 ; dissection of (illus.), 188. 



Tomato- worm larva (illus.), 362. 



Trap-door spider (illus.), 147. 



Tree-hopper (illus.), 367. 



Tree-toad (illus.), 310. 



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



Trenatodes, 63. 



Trichechu& latirostris (illus.), 238 



Trichina (illus.), 68, 69. 



Tridacna, 89. 



Trinomial names, 19. 



Trochilus colubris, 230. 



True fishes, 164. 



Tuatera (illus.), 207. 



Turdidce, 231. 



Turkey -buzzard, 236. 



Turkeys, 224. 



Turtles, 196, 202. 



Tympanuchus americanus, 225. 



Typhlichthys subterraneus (illue.) 

 173. 



Tyrannidoe, 231. 



Ungulata, 245. 



Uria lomvia arra (illus.), 330. 

 Urocyon cinereo-argentatus, 248. 

 Ursus americanus, 246 ; horribilU 



246. 

 Utolophus goodei (illus.), 299. 



Vedalia cardinalis, 289. 



Vedalias, 289. 



Vermes, 19. 



Vertebrata, 19, 163, 261. 



Vespa (illus.), 327, 328. 



Vespertilio fuscus, 242. 



Vestigial organs, 312. 



Vorticella (illus.), 27. 



Volvox minor (illus.), 33, 34 ; V. git 



bator (illus.), 34. 

 Vulpes pennsylvanicus, 248. 



Walking-stick insect (illus.), 35ft 

 Warning colors, 359. 

 Wasps, 142. 



Water-beetle (illus.), 311. 

 Whales, 242. 

 Wheel-animalcules (illus.), 83. 



