INDEX. 



671 



Echeneis, 577 

 Echidna, 631, 632 

 Echidnidae, 632 

 Echinarachnius. 345, 346 

 Echinobothrium, 286 

 Echinocardium, 34*? 

 Echinococcus, 288 

 Echinoderidse, 295 

 Echinoderma, 329 

 Echinoidea, 343 

 Echinorhynchus, 304 

 Echinosphaerite3, 342 

 Echiuroidea, 317 

 Echiurus, 317 

 Eciton, 488 

 Ecology, 4 



Ectethmoid bone, 522 

 Ectochondrostoses, 519 

 Ectocyst, 322 

 Ectoderm, 103, 156 

 Ectoparasites, 169 

 Ectopistes, 614 

 Ectoprocta, 322 

 Ectosarc, 189 

 Edentata, 635 

 Edriophthalmata, 438 

 Edrioasteroidea, 342 

 Edwardsia, 253, 255, 259 

 Edwardsiella, 259 

 Egg cell, 80 

 Egg of bird, 153 

 Egg, cleavage of, 149, 151 

 Egg, fertilization of, 147 

 Egg, maturation of, 146 

 Egg nucleus, 146, 149 

 Egg, segmentation of, 149, 151 

 Egg tooth, 593 

 Eichhorn, 13 

 Eiderduck, 615 

 Eimeria, 213 

 Elaps, 601 

 Elasipoda, 349 

 Elasmobranchii, 569 

 Elastic cartilage, 86 

 Elastic tissue, 85 

 Elastica externa, 5 16 

 Elastica interna, 516 

 Elastin, 85 



Elater, 199 

 Electric catfish, 576 

 Electric eel, 576 

 Electric organs, 563 

 Elephantiasis, 304 

 Elephantidge, 644 

 Elephants, 643 

 Elephas, 644 

 Elytra, 312, 466 

 Embiotocidse, 577 

 Embryo, 1 60 

 Embryology, 3, 139, 160 

 Emu, 613 

 Enamel, 515 

 Enchylema, 62 

 Enchytraeidse, 315 

 Encyrtidium, 193, 196 

 Encystment, 184 

 Endite, 410 

 Endocyst, 322 

 Endolymph, 127, 543 

 Endolymphatic duct, 542 

 Endopodite, 410 

 Endostyle, 506 

 English sparrow, 616 

 Enhydris, 647 

 Enopla, 290 

 Ensatella, 368 

 Entalis, 369 

 Entelops, 635 

 Enteroccele, 109 

 Enteroponeusta, 512 

 Entoconcha, 349 

 Entochondrostoses, 519- 

 Entoderm, 103, 156 

 Entomobrya, 477 

 Entomostraca, 414 

 Entoniscus, 441 

 Entoniscidae, 441, 442 

 Entoparasites, 169 

 Entophaga, 486 

 Entopldstron, 594 

 Entoprocta, 321 

 Entosarc, 189 

 Entovalva, 349 

 Environment, 54. 

 Eocene, 181 

 Eohippus, 643 



