626 



ANIMAL BIOLOGY 



Eggs, mosquito, 292 



mourning dove, 420 



mussel, 218 



myriapods, 275 



ostrich, 418 



parasitic nematodes, 181 



reptiles, 383 



robin, 421 



rotifer, 189, 190 



sharks, 347 



sheep liver fluke, 173 



spider, 304 



tapeworm, 176 



Texas nighthawk, 419 



turtles, 401 

 Egyptians, medicine, 578 

 Eimeria stiedae, 82 

 Elasmobranchii, 340 

 Elasmobranchs, 340, 344 



extinct, 347 

 Elastic fibers, 101 

 Electric eels, 534 

 Electric organs, 347 

 Electric rays, 347 

 Electrical energy, 38 

 Electrolysis, 12 

 Electrolytes, 11 

 Electrons, 8 

 Electrotropism, 56 

 Elements, 8, 19 

 Elephantiasis, 184 

 Elephants, 441, 442, 534, 551-553 



evolutionary series, 652 

 Elephas, 552 



Elimination, 33, 34, 37, 43, 104, 329, 331, 469- 

 470, 493-494, 516 

 (See also Digestive system) 

 Elk, Irish, 551 

 Elk-horn coral, 154 

 Elytra, 280 

 Emaciation, 44 



Embryo, 108, 176-177, 3G1, 362, 378, 384, 444, 

 476-478, 547, 548 

 (See also Eggs) 

 Embryogeny, 118-125, 201, 445, 475-478, 546 



variations, 123 



(See also Life history) 

 Embryology, 5, 118, 475, 583 

 Embryonic circulation, mammals, 446 

 Embryonic development, mammals, 444 

 Embryonic modifications, reptiles and birds, 



382 

 Emotions, 492, 501 

 Empedocles, 26, 544, 578 

 Emu, 420, 534 

 Emulsion, 11 

 Enaema, 570 



Enamel, 100, 324, 354, 426, 427 

 Encephalon, 334 

 Encystment, 68, 517 

 Endamoeba, histolytic, 88 

 Endocrine glands, 373, 374, 459, 461 

 Endoderm (see Entoderm) 

 Endolymphatic duct, 336, 337 

 Endomixis, 76, 77 



Endoparasites, 525 

 Endoplasm, 63, 64, 70, 86 

 Endoskeleton, 322, 324, 465-466 

 Endostyle, 317-320 

 Endothelium, 469 

 Energy, 15-16, 38, 458, 492 



changes in organisms, 480-485 



conservation, 16 

 Engine, and body, 481 

 Engraver beetle, work, 290 

 Enteron, 137, 160 



(See also Alimentary canal; Gastrovascular 

 cavity) 

 Enteropneusta, 676 

 Enterozoa, 130, 574, 576 

 Entoderm, 121, 122, 124, 125, 129, 130, 137, 144, 



157, 312, 444 

 Entomology, 5 

 Entomostraca, 267, 268 

 Entozoic, 80 

 Enzymes, 14, 329 



(See also Digestive enzymes; Ferments) 

 Eocene period, 551 

 Eohippus, 653 

 Ephelota gemmipara, 86 

 Ephydatia fluviatilis, 131 

 Ephyra, 152 

 Epibole, 123, 378, 477 

 Epidermis, 324, 366, 465 

 Epigenesis, 583 

 Epiglottis, 427 

 Epigynum, 303 

 Epimere, 478 

 Epipharynx, 278 

 Epithelia, 98-99, 104, 132, 324 



(See also Skin) 

 Epithelial cells, 31 

 Epitheliomuscular cells, 23, 138 

 Epizoic associations, 522 

 Equal cleavage, 118, 120, 477 

 Equatorial plate, 47 

 Equilibrium, 347, 473 



crayfish, 261 



fish, 360 



man, 337 

 Equilibrium, sense, 335, 347, 408 

 Erect posture, 451 

 Erector muscle of hair, 324 

 Esophagus, 198, 214, 216, 235, 237, 258, 259, 



282, 328, 342, 407, 438 

 Esophageal pouch, 237 

 Esox lucius, scale, 363 

 Estivation, 381 

 Ethiopian region, 633, 534 

 Ethmoidal cells, 336 

 Eugenics, 569 

 Euglena, 79 

 Eunice viridis, 254 

 Euplectella, 131 



Eupomotus gibbosus, mouth, 368 

 Eurosta solidaginis, gall, 291 

 Eurypterids, 542 

 Eustachian tube, 335-337, 368 

 Eutheria, 429 

 Evaporation, heat regulation, 483-484 



