856 



INDEX 



Dermacentor, 803. 835 

 Uermal bone, 438, 507 

 Dermal skeleton, 507 

 Derinaptera, 837 

 Deruialobia hominis, 805 

 Dermis, 395, 502, 503 

 Dermoptera, 493, 842 

 Descartes, Rene, 10 

 Desert biome, 793 

 Desiccation, resistance to, 226 

 Design of experiments, 6 

 Desmarella, 156 

 Desoxycorticosterone, 619 

 Desoxyribonucleic acid, 29, 683 

 Deuterostomous animals, 378, 381 

 Development, control of, 133 



direct, 452 

 Devilfish, 437 

 de Vries, Hugo, 704 

 Diabetes insipidus, 622 

 Diabetes mellitus, 564, 615, 620 

 Diabetogenic hormone, 626 

 Dialysis, 51 

 Diapause, 331 

 Diaphragm, 488, 532, 534 

 Diapsida, 840 

 Diastole, 552 

 Diatrynia, 841 

 Diatryniiformes, 841 

 Dibranchiata, 265, 834 

 Didelphis, 842 

 Diencephalon, 416, 597 

 Differentiation, 135, 287 

 Difflugia, 158, 159, 832 

 Diffusion, 45, 49 

 Digenea, 213, 833 

 Digestion, 81, 515 

 extracellular, 81 

 intracellular, 81 

 Digestive glands, 246, 368 

 Digestive pouches, 276, 310 

 Digestive secretions, control of, 524 



Digestive system, bird, 475 

 dogfish, 435 

 lamprey, 429 

 man, 517 

 vertebrates, 515 



Digestive tract, 81 

 development of, 642 

 hormones of, 634 



Digital pads. 452 



Digitigrade, 497 



Dihybrid cross, 656 



Dimetrodon, 466, 840 



Dinofiagellates, 154, 832 



Dinophilus, 269 



Dinosaurs, 462 



Diphycercal tail, 443 



Diploid number, 117, 169 



Diplopoda, 306, 837 



Dipnoi, 442, 840 



Diptera, 316, 837 



Distal convoluted tubule, 562 



Distomata, 832 



Diurnal migrations, 184 



DNA, 29 



Dog, 497 



Dogfish, 434, 436 



blood pressure of, 546 



circulatory system of, 435 



digestive system of, 435 



excretory system of, 435 



muscles, 513 



reproduction of, 435 



skeleton, 507 

 Dolphin, 497 



Dominance, incomplete, 656 

 Dominant gene, 654 

 Dorsal aorta, 409, 546 

 Dorsal cirrus, 272 

 Dorsal pores, 360 

 Dorsal root ganglion, 417, 591 

 Down feathers, 471 

 Drones, 347 

 Dryopithecus, 741 

 Ducks, 481, 483 

 Ductus arteriosus, 551 

 Dugesia, 204-211 



feeding in, 205 



reproduction in, 209 



sense organs of, 207 

 Duodenum, 404, 521 

 Duplication, 685 

 Dura mater, 599 

 Dutrochet, Rene, 11 

 du Vigneaud, Vincent, 622 

 Dynamic balance of nature, 779 



Ear, 581 



Ear ossicles, 584 



Earthworm, 269, 270 



Echinoderm-hemichordate 

 377 



Echinoderms, 391 



classification of, 364, 838 

 metamorphosis in, 379 

 relationships among, 375 



Echinoidea, 373, 838 



Echiuroidea, 353, 835 



Ecologic density, 770 



Ecologic isolation, 702 



Ecologic niche, 755 



Ecology, 753-830 



Ecosystem, 753 



Ectoderm, 128 



Ectoparasites, 802 



Ectoplasm, 1 57 



Edentata, 494, 842 



relationships. 



