INDEX 



571 



Crustacea, classification of, 241, 332, 



339; body plan of, 336. 

 Ctenophora, 237, 241, 274, 279, 281. 

 Cvlez, 386. 

 Cuticle, of earthworm, 299, 300; of 



Paramoecium, 177, 178. 

 Cuvier, 495, 496, 544. 

 Cyanea, 278. 



Cyclostomata, 10, 37, 39, 51, 241. 

 Cyst, formation of in disease, 211; 



in Hydra, 273; in Protozoa, 163, 



164, 172, 173. 

 Cytology, 2, 130, 474; in genetics, 



457, 474. 

 Cytopharynx, 166, 167, 176, 177. 

 Cytoplasm, 134; inclusions of, 135. 

 Cytopyge, 178. 

 Cytosome, 134, 136. 

 Cytostome, 166, 176, 177. 



Dadylometra, 278. 



Damsel-fly, 374, 378. 



Daphnia, 332, 334. 



Darwin, 25, 34, 285, 301, 645. 



Darwin's Theory of Natural Selection, 

 496, 544. 



Dellinger, 158. 



Demospongia, 241. 



Dendrite, 149. 



Dermis, 417. 



Determination of sex, 446. 



Determiner in heredity, see Gene. 



Development, 4, 218, 436; of Am- 

 phioxus, 398, 399; of birds, 425, 

 428, 429, 432; of craj-fish, 333; of 

 earthworm, 307; of fishes, 420, 

 421; of frog, 23, 400, 405, 411, 

 412; of Hydra, 272; of locust, 

 367, 368, 370; of mammals, 433, 

 434, 449, 450, 531; of reptiles, 422, 

 423, 424, 425. 



Diaphragm, 49, 356. 



Didinium, 176, 189. 



Diencephalon, 65, 116, 416; functions 

 of, 119. 



Diet, balanced, 78, 80; deficiencies in, 

 78, 79, 80, 81. 



Difflugia, 155, 164. 



Digestion, 81; in earthworm, 301; in 

 hydra, 261; intracellular vs. extra- 

 cellular, 261; in locust, 354; in 

 mouth, 81; in Protozoa, 161, 171, 

 184; in small intestine, 83; in 

 stomach, 82; summary, 86. 



Digestive cavity, see Enteron. 



Digestive enzymes, 81, 82, 83, 85. 



Digestive glands, 51, 82, 83. 



Digestive juices, 82, 83. 



Digestive system, of crayfish, 331; 

 of earthworm, 292; of frog, 51; of 

 locust, 353, 357. 



Digestive tract, of earthworm, 289; 

 of frog, 47, 83, 416; wall of, 87, 

 149, 150. 



Di-hybridization, 468, 469, 480. 



Dileptus, 189. 



Dinosaur, 506, 508, 509, 562. 



Diploblastic body plan, 260, 281. 



Diplodinium, 194. 



Diploid number of chromosomes, 231, 

 447. 



Diplomysius, 504. 



Dipnoi, 63; see also Lung fish. 



Diptera, 375, 384, 385, 386. 



Direct development, of insects, 370. 



Disease, Germ Theory of, 206. 



Disperse systems, 72. 



Dissimilation, 75, 93, 162, 184. 



Dissosteira, 344, 352. 



Distribution, of Amphibia, 14; of 

 crayfish, 321; of earthworm, 283; 

 geographical, 5, 507, 519; geologi- 

 cal, 5, 507; of locust, 343; of 

 vertebrates, 27. 



Division of labor, 274. 



Dominance in inheritance, 464, 467. 



Dorsal root ganglion, 108. 



Dorso-ventral differentiation, 244. 



Dragon-fly, 374, 378. 



Drosophila, 470, 558. 



Duckbill, 29. 



Ductless glands, 97. 



Duodenal glands, 83. 



Ear, 125. 



Earthworm, cellular structure of, 



