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 virginiana (illus.), 239. 

 Ditmyctylus, 186. 

 Diemyctylns torosus (illus.), 190. 

 Dieotyles torquatia (illus.), 249. 

 Digestion of food, 45. 

 Diodon hystrix (illus. ), 300. 

 Dfcmedeat exulans, 220. 

 Dipnoi, 170. 

 Diptera, 138. 



Dismal Swamp fish (illus.), 173. 

 Division of labor, 332. 

 Dog family, 248. 

 Doves, 225. 

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



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



386. 



Dry abates pubescens, 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. 



Echeneididfe, 335. 



Echinodermata, 19. 



Echinoderms, 150. 



Eciton, 323. 



Economic entomology, 413. 



Economic zoology, 404. 



Ectopifites migratorius, 225. 



Edentata, 239, 443. 



Edible worm (illus.} 408. 



Eels, 172. 



Egg -laying, 83. 



Eggs of different animals (illus. ), 255 



Maps, 361, 368. 



Embryology, 15. 



Embryonic development (illus. , 257), 



256. 

 Embryonic stages of vertebrate ani 



mals (illus.), 263. 

 Etnmydrichthys vulcanus (illus.), 



298, 299, 355. 

 Entomontraca, 110. 

 Environment, 395. 

 Eohippus, 431. 



Epialtm prodoctus (illus.), 120. 

 EpideUa, 64. 

 Erenthizon dorsatits, 240. 

 Eretmochelys imbricata (illus. ),203. 

 Ergates (illus.), 140. 

 Erynnis Manitoba, 436. 

 Euglena, 25. 

 Eumeces, 199. 



Eunice fucata Elders (illus.), 408. 

 Eurypelma lentzii (illus.), 146. 

 Exoccetus (illus.), 297. 



Fairy-shrimp (illus.), 111. 



Falco sparverius, 226. 



Fauna and faunal areas, 440 ; of the 



sea, 446. 

 Feeding, 391. 

 Felis concolor, 248 (illus.), 249, 



F. caffra, 248. 

 Ferae, 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.), 62; excretory system, 62; 



parasitic, 63 (illus.), 64. 

 Fleas, 138. 

 Flicker, 228. 

 Flies, 138. 

 Flounder, development of 



274. 



Flying fishes (illus.), 397. 

 Food, 4, 



