INDEX 



525 



Elimination of the unfit, 463, 502. 



383. 453- 

 Elm gall, 208. 

 Elytra, 218. 

 Elytron, 192. 

 Etnberiza citrinella, 330. 

 Embryology, 7, 514. 

 Embryology, definition of, 513. 

 Embryology, in evolution, 472. 

 Embryos, of vertebrates, 473. 

 Emotions, of animals, 492. 

 I Imperor snake, 317. 



Emus, 339.454- 

 Emydidae, 323. 



iloccele, 269. 

 Enchenopa, 208; protective resemblance, 



403- 

 Encrusting barnacles, 157, 158. 

 Endopodite, 147. 



tyle, of Tunicata, 264, 265, 267. 

 English sparrow, 452, 455. 

 Ensis americana, 249. 

 Enteropneusta, 259. 

 Entomostraca, 148, 451. 

 Entoplasm, 21. 

 Entoprocta, 129. 

 Entosarc, 21. 



Environment, effect of, 459. 

 Eocene period, 13, 443. 

 Eokippus, 379, 433. 

 Epeira diadema, 182, 183. 

 Ephemera, larva, 198. 

 Ephemera vulgata, 198. 

 Ephemerida, 226. 

 Ephyrae, 79, 81. 

 Epicoracoid, of frog, 301. 

 Epicrium glutinosum , 307. 

 Epidermal strictures, of Mammalia, 356. 

 Epididymis, of dogfish, 277. 

 Epigenesis, 498, 500. 

 Epiglottis, of Mammalia, 360. 

 Epi-stemum, of frog, 301. 

 Epis/ylis umbellaria, 48. 

 Equidoe, 433. 

 Equus, 434. 

 Equus asinus, 379: E. caballus, 379; E. 



zebra, 378. 

 Ergasilus, 155. 

 Erinaceus enropcsus, 393. 

 Ermine, 399. 

 Errantia, 138. 

 Estheria, 151. 

 Ethiopian region, 453. 

 Ethology, definition of, 514. 

 Eudyptes antipodum, 340. 

 Euglena viridis, 38. 

 Euornithes, 341, 452. 

 Ewplectella, 61, 450. 

 Euplexoptera, 226, 227. 



European fox, 401. 



European hare, 392. 



1 uropi m porcupine, 391. 



terus fischeri, 175,423. 

 Euspongia, 56. 



Eustai hian aperture, of pigeon, 333. 

 Eustachian tube, of Amphibia, 302; of 



birds, 332; of frog, 301. 

 Eutheria, 367. 

 Even-toed l Ingulata, 380. 

 Everglade gray squirrel, 387. 

 Evolution, 460. 

 Evolution of man, 478, 479. 

 Evolution, suggested by Aristotle, 496; by 



Buffon, 502; by Charles Darwin, 508; 



by Erasmus Darwin, 502; by Kant, 



503; by Lamarck, 504; by St. Hilaire, 



506; by Spencer, 508. 

 Evolution, theory of, 470. 

 Excretory system, of birds, 334, 333. 

 Exoccipital, of frog, 300. 

 Exopodite, 147. 

 Experience, 486. 

 Experiment stations, 511. 

 External gills, in Gymnophiona, 307 ; of 



Xecturus, 303. 

 Extinction of animals, 442. 

 Eyelids, of Amphibia, 302; of birds, 330; 



of Crocodilia, 325; of lizards, 312; of 



Reptilia, 308 ; of turtles, 322. 

 Eyes, of cave animals, 472; of deep-sea 



animals, 449; of Mammalia, 357. 



Factors in distribution, 456. 



Falcincllus igneus, 330. 



Falco biarmicus, 327; F. candicans, 330; 

 F. peregrinus anatum, 346. 



Falconry, 346. 



Falcons, 346. 



Fallopian tubes, of Mammalia, 361. 



False vampire bat, 397. 



Family, 9 ; of lower animals, 491. 



Fantails, 461, 462. 



Fats, 4. 



Fauna, definition of, 444. 



Fear, 484. 



Feather stars, 87. 



Feather tracts, 328. 



Felidce, 403. 



Felts bor ealis, 404 ; F. catus, 404 ; F. con- 

 color, 403; F. domestic a, 404; F. leo, 

 403, 441; F. pardits, 403; F. spelesa, 

 441 ; F. tigris, 403. 



Felt need, in instinctive behavior, 485. 



Female reproductive organs, of Mammalia, 

 361. 



Femur, of cockroach, 203; of fowl, 331; of 

 frog, 300 ; of gorilla, 359 ; of insects, 192. 



Fer-de-lance, 319. 



