930 



INDEX 



Didinium. 70 

 Diencephalon, 419, 4fa9 



of frog, 526. 

 Differential birth rate, 8^9 

 Differentiation, 801 



intercellular, 104 

 Difflugia, 67 

 Digenea, 161 

 Digestion in frog, 501 



intracellular. 130 , . . +-„„, 



Digestive enzymes and their functions, 



387 

 system, 109 

 cat. 646 

 chicken, 601 

 toad, 541 

 tract, solitary wasp, .50» 

 Digitigrade gait, 641 

 Dihybrid cross, 820 

 Dinocardium, shell. 7 a 

 Dinosaurs, 869 

 DioctophjTne. 176 

 Dioctophymoidea, order, 17b 

 Diodontidae, 455 

 Dioecious, 112 

 Diphyllobothrium, 161 

 latum, fish tape, 741, 742 

 tape, 765 

 Diplasiocoela, suborder 486 

 Diploblastic condition, 130 



form, 120 

 Diploid condition, 800 



number. 114 

 Diplopoda, 265, 288, 290 

 Dipnoi, subclass, 455 

 Dipsomania, 839 



Diptera, order, 266, 329 ^ 



Dipylidium caninuin, dog tape, 763, .bo 

 Discoblastula, 806 

 Discocephali, suborder. 4o4 

 Discomedusae, 137 . ^ 

 Dispersal in distribution a< 

 Dissosteira spurcata, 344^ 

 Distribution of animals, ai 

 Diverticula, 167 

 Diverticulae. 213 

 Dobson flies, 322 

 Dog, 628 

 Dogfish, freshwater. 447 



.shark. 422 ., 



Dolichoglo'sus, nervous system, obJ 



kowalevskii, 362 

 Doliolum. 361 



Dolphin. 634 . . ,^ „- 090 

 Dominance, principle ot, iiz6 



Dominant, 45 

 Doodlebugs, 322 

 Dorosomidae, family, 448 

 Dorsal aorta. 605 

 Dosimeter, 706 

 Dourine. 80 

 Doves, 591 



mourning, 591 ^ 



Dracunculus, Guinea worm. (4.j 

 Dragonflies, 265, 319. 321 

 Drassidae. family, 295 

 Drassids, 295 

 Drassus neglectus. 296 

 Prill. 636 , ^ „„„ 



Drosophila melanogaster. 82S 

 Drumfishes. 4.54 

 Dryobates pubescens, 59o 

 Duck mole, 617 

 Duckbill. 617 

 Ducks. 589, 788 

 Duct of Botallus. 491 



of Cuvier. 445 

 Dujardin. 49 

 Duodenum. 382 



Dura mater, 527, 650 

 Dussumuriidae, family. 448 

 Dwarfism, 673 

 Dysgenic. 839 



E 

 Eagles, 589 

 bald, 590 

 golden. 590 

 Ear structure. 402 

 Eardrum, 498 

 Earthworm. 199 



circulatory system. 20o 

 development, 210 

 internal anatomy, 201 

 Earwigs, 265 

 Ecdysis. 263 

 Echeneidae, family. 4.54 

 Echinarachnius, 222 

 Echinaster, 218 

 Echinococcus, 756 



dog tape, 745 

 Echinoderm theory of evolution. SbS 

 Echinodermata. 26 

 Echinoderms, larval relations. 8bb 

 Echinoidea, class, 219 

 Echiuroidea, order, 194, 214 

 Ecology, 24, 719 ^ ^ , ,. o,a 



Economic importance of entomology, 6w 

 relations of birds, 596 

 of mammals, 637 

 Ectethmoid, 406 

 Ectoderm, 117, 130 



of frog, 535 

 Ectoparasite. 737 

 Ectopistes, 786 



migratorius. 591 

 Ectoprocta, 184 

 Ectopterygoid, 467 

 Ectosarc, 81. 86 

 Edentata, order, 621 

 Eel, 443 

 Eels, 449 

 conger, 449 

 morey. 4.50 

 Eelworm, 175, 180 

 Egg. centrolecithal, 803 

 guides. 349 

 of hen, 615 

 "Egg tooth," 615 - 

 Egret, 588 



Egretta candidissma, 08*5 

 Elapidae, family, 558 

 Elasmobranchii. class, 411, 4_V 



economic relations. 425 

 Elateridae. family, 324 

 Electrons, 697 

 Electrotropism, 77 

 Elephantiasis. 745. 746 

 Elephants. 634 ^ roj. 



Elephas indicus, elephant. 6u4 

 Eleutherodactylus latrans. 479 



ricordii, 472 

 Elks, 630 

 Elops saurus. 447 

 Elytra. 322. 354 

 Embiidma. order. 2b.\ 666 

 Embids. 205 

 Embryology, 23 

 comparative, 798 

 of frog, 532 



later stages, 537 

 of toad, 544 

 Embryonic membranes 81 1 

 Empoasca fllamenta, 317. 3^u 

 Emulsoid. 53 



Emus. .585 _,_ ^__ 



Emvdidae, family of turtles. :i49, on 

 Emys blandingii, 549 



