452 



ANIMAL STUDIES 



Dentrostoma (illus.), 85. 

 Dependence of species, 288. 

 Development, first stages in (illus. ), 



256', 257 ; continuity of, 259 ; gas- 



trula stage, 260; divergence of, 



260 ; laws or general facts of, 262 ; 



significance of the facts of, 265. 

 Devil-fish (illus.), 105, 106. 

 Devonian age, 426. 

 Diamond-rattlesnake (illus.), 202. 

 Diapheromerafemorata (illus.), 356, 



357. 



Didelphys virginlana (illus.), 239. 

 Diemyctylus, 186. 

 Diemyctylus torosiis (illus ), 190. 

 Dieotyles torquattts (illus.), 249. 

 Digestion of food, 45. 

 Diodon hystrix (illus. ), 300. 

 Diomedea exulans, 220. 

 Dipnoi, 170. 

 Diptera, 138. 



Dismal Swamp fish (illus. ), 173. 

 Division of labor, 332. 

 Dog family, 248. 

 Doves, 225. 

 Dragon-flies (illus., 135), 134; eye 



of (illus.), 386 ; compound (illus.), 



386. 



Dryobatespubescens, 228. 

 Ducks, 221. 

 Duration of life, 275. 



Eagles, 226. 



Earthworms, 72; dissection of (il- 

 lus.), 73; circulatory system, 73; 

 diagram of kidney (illus.), 74; ex- 

 cretion, 74 ; nervous system, 75 ; 

 egg-laying, 75 ; distribution, 76. 



Echeneididce, 335. 



Echinodermata, 19. 



Echinoderms, 150. 



Eciton, 323. 



Economic entomology, 413. 



Economic zoology, 404. 



Ectopistes migratorius, 225. 



Edentata, 239, 443. 



Edible worm (illus.), 408. 



Eels, 172. 



Egg-laying, 82. 



Eggs of different animals (illus.), 255. 



Maps, 361, 368. 



Embryology, 15. 



Embryonic development (illus. , 257), 

 256. 



Embryonic stages of vertebrate ani- 

 mals (illus.), 263. 



Emmydrichthys vulcanus (illus.), 

 298, 299, 355. 



Entomostraca, 110. 



Environment, 395. 



Eohippus, 431. 



Epialtus prodoctus (illus.), 120. 



Epidella, 64. 



Erenthizon dorsatus, 240. 



Eretmochelys imbricata (illus.), 203. 



Eryates (illus.), 140. 



Erynnis Manitoba, 436. 



Euglena, 25. 



Eumeces, 199. 



Eunice fucata Elders (illus.), 408. 



Eurypelma lentzii (illus.), 1*6. 



Exoccetus (illus.), 297. 



Fairy-shrimp (illus.), 111. 



Falco sparverius, 226. 



Fauna and faunal areas, 440 ; of the 



sea, 446. 

 Feeding, 391. 

 Fells concolor, 248 (illus.), 249; 



F. caffra, 248. 

 Ferse, 246. 



Fiber zibethicus, 241. 

 Fiddler-crab (illus.), 120. 

 Fishes, 164; senses of, 178; pelagic, 



446. 



Flagellate infusoria (illus.), 26. 

 Flatworms (illus.), 60; digestive 



system, 61 ; nervous system and 



sense-organs, 62 ; flame-cell of 



(illus.), 6'3; excretory system, 62; 



parasitic, 63 (illus.), 64. 

 Fleas, 138. 

 Flicker, 228. 

 Flies, 138. 

 Flounder, development of (illus.), 



274. 



Flying fishes (illus.), 297. 

 Food, 4. 



