INDEX 



537 



Ducks, 412 

 Ductless glands, 340 

 Ductus Cuvieri, 364 

 Dugong, 452 



Eagle, 419 



Ear, 354 (see auditory organs) . 



Earthworm, 222 



Earwigs, 299 



Echidna, 449 



Echinodermata, 145, 207 



Echinoidea, 220 



Echinus, 209 



Ecology defined, 4 (see also adapta- 

 tion); of protozoa, 161; porifera, 171; 

 coelenterata, 185; unsegmented 

 worms, 203; echinoderms, 219; an- 

 nulata, 235; mollusks, 255; arthro- 

 pods, 289; fishes, 366, 370; amphibia, 

 379; reptiles, 391; birds, 422; mam- 

 mals, 459 



Economic zoology, 498 



Ectoderm, 38, 39 



Ectosarc, 152 



Edentata, 450, 451 



Education, 470 



Egg, 30 



Elasmobranchii, 372 



Electric organs, 370 



Elephant, 454 



Elytra, 304 



Embryology, 481 



Embryology, defined, 4 (see develop- 

 ment), history of, 513 



Emu, 411 



Enamel, 50 (see teeth), 442 



Endopodite, 267 



Endosarc, 152 



Endoskeleton, 72, 327, 403 (see also 

 skeleton). 



Endothelium, 52 



Ensis, 257 



Entoderm, 38, 39 



Entomostraca, 292 



Environment, 99, 102, 112, 495 



Epeira, 308 



Ephemerida, 298 



Epiblast (see ectoderm). 



Epicranium, 272 



Epidermis (see integument), 325 



Epinephelus, 373 



Epithelial tissue, 48-53 



Equilibrium sense, 81, 354 



Erethizon, 456 



Ethnography, 474 



Eugenics, 519 



Euglena, 153, 157 



Eutcenia, 395 



Euthyneura, 260 



Eustachian tube, 354 



Evolution, meaning, 476; evidences, 

 479; course of, 485; factors in, 486 



Excretion, 17, 66, 71 



Excretory systems ccelenterates, 1827 

 unsegmented worms, 193, 194;, 

 echinoderms, 216; annulata, 231;. 

 mollusks, 251; arthropods, 283; ver- 

 tebrates, 344 



Exopodite, 267 



Exoskeleton, 72, 324 (see also integ- 

 ument). 



Eyes, 82, 285, 355 J median, 389 



Eye-spots, coelenterata, 183; annulata, 

 232 



Facial nerve, 352 

 False amnion, 409 

 Fat cells, 55 

 Fats, ii 



Faunas, type of, 135 

 Feathers, 399, 402 

 Femur, 332 

 Ferments, 10 

 Fertilization, 36, 42, 74 

 Fibrillas (muscle), 59 

 Fibrous connective tissue, 54, 55 

 Fin, 360 

 Finches, 420 

 Fishes, 144, 315, 358 

 Fish Commission, work of, 368 

 Fission, 191, 194 

 Flame-cell, 192, 194 

 Flamingo, 415 



Flat- worms (see platyhelminthes, 192) 

 Fleas, 300 

 Flies, 300 



Fcetal membranes (see amnion and 

 allantois). 



