Index 



703 



Ecotone, 652 

 Ectoderm, 282, 287-288 

 Ectoplasm, 359, 368 

 Edentata, 630, 635 

 Eel, 587, 589, 590 

 Eelworm (see Anguina), 430 

 Effector, 193, 209 

 Efferent blood vessel, 188 



nerve, 203, 205 

 process, 194, 196 



neuron, 203, 209 

 Egg, 252, 253, 275 



Ascaris, 431 



bird, 284 



crayfish, 504 



fluke, 410. 413, 414, 415 



frog, 50, 61, 72-73 



guide, 527 



human, 262, 284 



insect, 520, 527 



isolecithal, 283 



mammal, 242 



organization, 293-294 



pouch, 527 



sea urchin, 551 



sharks and rays, 581 



squid, 480 



tapeworm, 417 



telolecithal, 283-284 

 Eimeria, 363-364 

 Ejaculatory duct, 428 

 Elasmobranchii, 575, 576 

 Elastic basement membrane, 405 

 Elbow (see olecranon process), 109 

 Electric catfish, 126 



eel, 126 



organs, 126 



ray, 576, 580, 581 

 Electrical changes in brain, 210 

 in muscle, 122 



stimulation, 198 

 Electroencephalogram, 211 

 Electron, 25, 28 



microscope, 266 

 Element, 25. 26. 28 

 Elephant. 174. 256, 292, 630, 639 

 Elephant bird, 625 

 Elephantiasis, 436-437 

 Elephas, 630 

 Embolus, 180 

 Embryo. 260, 278-295 

 Embryology, 21. Ill, 278-295 



comparative. 324 



early. 280-287 



experimental, 293-295 



organogeny, 287-289 



sponge, 379-380 

 Embryonic disc. 284 



membranes, 290-292, 629 



mesenchyme, 289 



Emergency theory, 234 

 Emu, 623 

 Enamel, 86 

 Enchytraeidae, 462 

 Enchytraeus, 449 

 Endamoeba, 362 

 Endocrine system, 40, 225-251 



of frog, 71-72 

 Endocrinology, 21 

 Endocuticle, 487 

 Endolymph, 222, 223, 224 

 Endometrium of uterus, 261, 262, 263 

 Endomixis, 370 

 Endoplasm, 359, 368 

 Endopodite, 495, 496, 498 

 Endoskeleton, 92, 94 



of Cambarus, 497 



of starfish, 545 

 Endostyle, 562, 565, 573 

 Endothelium, 169, 170 

 Energy, 34 



kinetic, 34 



potential, 34 



production, 153 

 Enterobius, 435 

 Enterocoel, 447, 542 

 Enterocrinin, 140, 141, 248 

 Enterogastrone, 140, 141, 142, 248 

 Enterokinase, 139, 140, 248 

 Enteron, 396 



Enteropneusta, 348, 556-558 

 Entoderm, 282, 288 

 Entomology, 21 

 Entoprocta, 347, 443, 445 

 Environment, factors in, 648-657 



internal. 159. 160. 184. 212 

 Enzyme, 32, 137, 138, 139, 140, 316 

 Eocene epoch, 331, 342 

 Eohippus, 331 

 Eosinophil, 177, 178 

 Eosuchia, 603 

 Ephelota, 374 

 Ephemeroptera, 538 

 Ephyra, 395 



Epibranchial groove, 565 

 Epicondyle, 109, 110 

 Epicuticle, 487 

 Epidermis, of frog. 54, 55 



of mammal. 79-80, 82, 130 

 Epididymis, 257 

 Epigenesis, 278-279 

 Epiglottis, 108. 131, 150 

 Epigynum, 512 

 Epilimnion, 662 

 Epimera, 492 

 Epimere, 288 



Epinephrine (see Adrenalin), 234 

 Epipharynx. 528, 529 

 Epiphysis (see pineal body), 69, 98, 

 199, 249 



