706 
Duck, summer, 543 
Dugong, 596 
Dysmorphosa, 60 
EHaaue, bald-headed, 548 
Ear, 641 
of clam, 225 
of crustacea, 271 
Ears of mammals, 563 
Earwig, 344 
Earthworm, anatomy of, 167 
embryology of, 168 
Ecardines, 196 
Echeueis remora, 454 
Echidna hystrix, 573 
Echinarachnius parma, 205 
Echinococcus, 117 
Kchinoderes, 187 
Echinodermata, blood system of, 
182, 212 
characters of, 178 
direct development of, 
196, 208, 215 
“heart” of, 182, 186 
metamorphoses of, 188, 
194, 202 
nervous system of, 179, 
186 
skeleton of, 179, 200 
viviparous, 192, 203, 204 
water-vascular system of, 
181, 212 
Echinoidea, 199, 208 
Echinorhynchus angustatus, 124 
claviceps, 124 
Echinorhynchus gigas, 123 
Echinus, 199 
esculentus, 205 
Echiurus, 162 
Eciton, 363 
Ectoderm, 6 
Ectoprocta, 146 
Educabilia, 582, 591 
Edentata, 577, 629 
INDEX. 
Edible Holothurians, 217 
sea-urchin, 205 
Edwardsia, 78 
Eel, breeding habits of, 446 
conger, 446 
sound produced by, 444 
Eel pout, 458 
Eggs, winter, of Crustacea, 280 
Planarians, 103 
Polyzoa, 145 
Rotatoria, 136 
Elasmobranchii, characters of, 
414, 463 
development of, 418 
eyes of, 417 
teeth of, 4f6 
Elaps, 497, 678 
Elasmosaurus platyurus, 513 
Electrical eel, 450° 
fish of the Nile, 449 
ray, 422 
Elephant, 597 
Elephas, 597 
primigenius, 598 
Elk, 608 
Elytra, 352 
Embryology, 13, 648 
Encrinites, 183 
Encrinus liliformis, 219 
Endocyst, 139 
Endoderm, 6 
Endostyle, 389 
Enneacanthus obesus, 456 
Enopla, 157 
Enteropneusta, development of, 
158 
structure of, 157, 159 
Entomostraca, 277, 305 
Entoprocta, 146 
Eohippus, 602 
Epeira vulgaris, 348 
Ephemera, 348 
Epigonichthys cultellus, 408 
Epipodium of mollusks, 238 
