INDEX 



857 



Effectors, 103, 574 

 Efferent neurons, 588 

 Egg, 114, 566 



cleidoic, 455 



mammalian, 637 

 Egg cells, 61 

 Egg shell, 454 

 Elasmobranchii, 436, 839 

 Elastic fibers, 56 

 Electric organ, 103 

 Electrolytes, 23 

 Electron, 1 9 

 Electron microscope, 17 

 Electron transmitting enzymes, 72 

 Elements, 19 



radioactive, 21 

 Elephant, 499 

 Elephantiasis, 811 

 Elephas, 842 

 Eleutherodactylus, 452 

 Eleutherozoa, 376, 838 

 Embioptera, 837 

 Embryo, protection of, 131 

 Embryologic evidence for evolution, 729 

 Embryonic development, 126 

 Embryonic disc, 640 

 Enamel, 516 



Endocrine interrelationships, 635 

 Endocrine systems. 111, 605-636 

 Endoderm, 128, 639 

 Endolyraph, 581 

 Endometrium, 631 

 Endoplasm, 157 

 Endoplasmic reticulum, 17 

 Endopodite, 294 

 Endopterygota, 315, 837 

 Endoskeleton, 96, 507 

 Endostyle, 386, 388, 431 

 Endothelium, 551 

 Energy, 47 

 Energy cycle, 759 



"Energy-rich" phosphate compounds, 71 

 Energy transfer, efficiency of, 767 

 Entamoeba, 801, 832 

 Enterocoele, 1 29 

 Enterocoelom, 238 

 Enterocoelomata, 241 

 Enterocoelous, 381 

 Enterogastrone, 525 

 Enterokinase, 523 

 Enteropneusta, 360, 838 

 Entoprocta, 353, 834 

 Entotrophi, 837 

 Environmental resistance, 773 

 Enzyme(s), 27, 65, 66 



digestive, 523 



properties of, 66 

 Enzyme activity, factors affecting, 69 

 Enzyme denaturation, 69 



Enzyme inhibitors, 70 



Enzyme-substrate complex, 69 



Enzyme synthesis, 686 



Enzyme systems, evolution of, 784 



Eocene, 725 



Eosinophils, 59, 542 



Eosuchia, 840 



Ephemerida, 313 



Ephemeroptera, 837 



Epiboly, 129 



Epiceratodm, 437, 840 



Epidermis. 181, 395, 502 



Epididymis, 123, 569 



Epigenesis, 133 



Epiglottis, 532 



Epinephrine, 606, 617, 626 



Epitheliinn, ciliated, 55 



columnar, 54 



cuboidal, 54 



squamous, 54 

 Equilibrium, 109, 581 

 Equus, 708, 842 

 Erectile tissue, 1 23, 569 

 Ergosterol, 527 

 Erioasteroidea, 838 

 Errantia, 834 



Erythroblastosis fetalis, 545, 679 

 Erythrocytes, 539 

 Esophagus, 430, 518 

 Esox, 839 



Estradiol, 607, 628. 632 

 Estrous cycle, 631 



control of, 626 

 Ethiopian realm, 736 

 Eucarida, 836 

 Eucestoda, 833 

 Eucoelom, 220, 244 

 Eucoelomata, 238 

 Eucopepoda, 836 

 Eudorina, 155 

 Euglena, 150, 152 



cell division of, 166 

 Euglenida, 154, 832 

 Eulamellibranchiata, 834 

 Eunuch, 628 

 Euphausiacea, 304, 836 

 Euplectella, 175, 832 

 Euryapsida, 840 

 Eurypterida, 320, 723, 835 

 Eurythermic, 760 

 Eustachian tubes, 415, 518, 584 

 Eutheria, 491, 842 



adaptive radiation of, 492 

 Evolution, 695-753 



cultural, 751 



evidence for, 716-736 



history of, 696 



of land vertebrates, 704 



principles of, 713 



