5^4 



INDEX 



Ductus botalli, 294, 450 

 Dugong, 409 

 Dyads, 504, 505 

 Dytiscidae, 194 



EAGLE RAYS, 227 



Earthworm, cross section, 114 



Earthworm, internal anatomy, 108 



Earwigs, 180 



Ecaudata, 269 



Ecdysis, 205 



Echinodermata, 129-141; economic im- 

 portance, 141; characteristics, 130; 

 classification, 129 



Echinorhynchus gigas, 96 



Ecology, 3 



Economic gain from crayfish, 169 



Economic importance, amphibia, 300 



Economic importance of Amphioxus, 216 



Economic importance of birds, 368 



Economic importance of fishes, 261 



Economic importance of Porifera, 51-52 



Economic importance of Reptilia, 332 



Economic importance of Tunicates, 213 



Economic importance, starfish, 135 



Economic loss from crayfish, 169 



Ectoderm, 55, 58, 509 



Ectoparasites, 483 



Edema, amphibian, 274 



Edentata, 396 



Edible birds' nests, 365 



Edwards, Vinal, 297 



Eels, 245 



Effects of parasitism, 483 



Egg case of skate, 237 



Eggs of humming bird, 351 



Egyptian wild cat, 382 



Eider duck, 340 



Eigenmann, cave fishes, 244 



Elapine snakes, 317 



Elasmobranchii, 225 



Electric eel, 260 



Electric ray, 227 



Electropaxes, 230 



Elephant bird, 335 



Elephantiasis, 95 



Elephants, 398, 399 



Elephant seal, 389 



Elephas Africanus, 399 



Elephas Indicus, 399 



Elytra, 102 



Embryology of pond snail, 160 



Embryology of the barnacles, 173 



Empedocles, 510 



Emu, 335 



Emys europaea, 306 



Enchytraeus albidus, 105 



Encystment, 43 



Endocrine glands, 10 



Endoderm, 55, S8, 509 



Endo-parasites, 483 



Endosecretory glands with a duct, 444 



Endosecretory glands without a duct, 445 



Endostyle, tunicate, 212 



Enemies of lobster, 168 



Engle, 448 



Ensis, 149 



Entameba buccalis, 27 



Entameba histolytica, 26 



Entameba intestinalis, 26 



Enterokinase, 432 



Entomostraca, 170 



Environment, 499 



Enzymes, 10, 440 



Eoanthropus dawsoni, 416 



Eohippus, 491 



Epeira, 202 



Ephemerida, 179 



Ephestia, 503 



Epidermal sense organs, 115 



Epidermis, 427 



Epigenesis, 509 



Epiphysis, 448 



Epithelium, 424 



Epitoke, 118 



Equatorial plate, 501 



Equilibrium of crayfish, 168 



Equus, 491; caballus fossilis, 491; prze- 



walski, 491 

 Erythrocytes, 456 

 Esophageal papillae, 326 

 Esophagus, 430 



Eugenics, 544; Record Office, 545 

 Euglena, 28 

 Eugyra, 211 

 Eumenidae, 197 



