474 



INDEX. 



Dimorphism (sexual), 69 



Dipnoi, 369 



Diptera, 296 



Direct cell-division, 23 



Discophora, 232 (leeches) 



Dispersal of animals, 128 



Dissimilation, 15 (katabolism) 



Distomum, 189, 190 



Distribution, geographical, 4, 129 



Division (cell), 23 



Division of labor, 59 



Dodo, 416 



Dogs, 443 



Domestication of animals, 97 



Dorsal vertebrae, 327 



Dorso-ventral axis (see symmetry) 



Dove, 416 



Draco, 390 



Duck-bill, 439 



Ducks, 408 



Ductus Cuvieri, 362 



Dugong, 441 



Eagle, 417 



Ear, 350 (see auditory organs) 



Earthworm, 216 



Echidna, 439 



Echinodermata, 138, 200 



Echinoidea, 214 



Echinus, 203 



Ecology defined, 4 (see also adapta- 

 tion) ; of protozoa, 146, 154 ;porifera, 

 163; ccelenterata, 178; unsegmented 

 worms, 197, 199; echinoderms, 212; 

 annulata, 230; mollusks, 251; ar- 

 thropods, 286 ; fishes, 363, 367 ; 

 amphibia, 376 ; reptiles, 385 ; birds, 

 403 ; mammals, 448 



Ectoderm, 34 



Ectosarc, 145 



Edentata, 441 



Egg, 29 



Egret, 412 



Elasmobranchii, 368 



Electric organs, 367 



Elephant, 443 



Elytra, 301 



Embryology, defined, 4 (see develop- 

 ment) 



Embryonic tissues, 50 



Emu, 408 



Enamel, 50 (see teeth), 432 



Endopodite, 263 



Endosarc, 145 



Endoskeleton, 67, 324, 399 (see also 

 skeleton) 



Endothelium, 42 



Ensis, 253 



Entoderm, 34 



Entomostraca, 288 



Environment, 92 



Epeira, 305 



Epiblast (see ectoderm) 



Epicranium, 269 



Epidermis (see integument), 323 



Epinephelus, 370 



Epithelial tissue, 42-46 



Equilibrium sense, 75, 349, 351 



Erethizon, 445 



Euglena, 144, 150 



Eiitcenia, 391 



Euthyneura, 256 



Eustachian tube, 351 



Excretion, 16, 61, 65 



Excretory systems coelenterates, 174; 

 unsegmented worms, 186, 188 ; 

 echinoderms, 209 ; annulata, 225 ; 

 mollusks, 247 ; arthropods, 280 ; 

 vertebrates, 341 



Exopodite, 263 



Exoskeleton, 67, 324 (see also integ- 

 ument) 



Eyes, 76-78; 281, 282, 351, 352; 

 median, 385 



Eye-spots, ccelenterata, 175 ; echino- 

 derms, 211 ; annulata, 226 



Facial nerve, 349 



False amnion, 405 



Fat cells, 48 



Fats, 10 



Faunas, type of, 129 



Feathers kinds, 395, 399 ; structure, 



395 



Femur, 269 

 Ferments, 10 

 Fertilization, 30, 68 

 Fibrillse (muscle), 53 

 Fibrous connective tissue, 48 

 Fin, 357 



Fishes, 137, 312, 355 

 Fish Commission, work of, 366 

 Fission, 184, 188, 229 

 Flame-cell, 186, 187 

 Flamingo, 411 



Flat-worms (see Platyhelminthes, 185) 

 Fleas, 297 

 Flies, 297 

 Foetal membranes (see amnion and 



allantois) 

 Foraminifera, 153 

 Formative pole, 32 

 Fox, 443 

 Frog, 315, 378 

 Frontal section, 83 

 Fruit-borers, 300 



