INDEX 



Coupled reactions, 28, 36 



Co\alent bonds, 23 



Coxal glands, 485, 519 



Crabs, 423, 440 



Cranial nerves, 89; of Branclnosloma, 552 



Craniala. 216, 539, 541, 553-592 



Cranium, 553 



Crnssoslrea, 376, 379, 380 



Crayfish, 423, 424-436, 440, 611; circulatory 

 system, 514; digestive glands. 513; host of 

 branchiobdellids, 417; reproduction, 533 



Crepidida, 384 



Cretaceous Period, and fossil birds, 574 



Cretin, 119 



Cricket, 462 



Crinoidca, 216, 486. 487, 506, 507 508 



Crista. 109 



Crocodilia, 572, 574 



Cro-Magnon man, 639, 643 



Crop, 48; of earthworm, 405; of locust, 448, 

 449 



Cross-fertilization, 175; in hermaphrodites, 

 534 



Crossing over, 201 



Crustacea, 216, 423, 424-441 



Crustaceans, as herbivores, 608; calcium re- 

 quirements, 601; chemical coordination, 

 525; circulatorv system. 514; excretory 

 organs, 519; gas exchange, 516; in pond 

 community, 606; parthenogenesis, 535 



Cryplobranchus, 563, 564 



Crystalline style, 373 



Ctcnophora, 216, 219, 221, 222. 310-312, 513, 

 518, 531 



Ctenoplana, 3 1 2 



(jtnitiiarw. 507 



Culex, 476 



Curaforemami, 317 



Cutaneous respiration, in annelids. 421 



Cuiiclc. ol acanthocephalans, 354; of annelids, 

 421, 484, 528; of aschelminths, 528; of 

 cestodes, 528; of earthworm, 414; of nema- 

 todes, 350; of trematodes, 328, 528 



Cuvier, 647; and classification, 223; and mol- 

 lusk,s, 370 



Cyanea, 304 



Cyannnlla cnstalus, 578 



Cyanocobalamin, 34, 74, 76 



Cyanopsin, 107 



Cyclops, 339 



Cyclosis, 513; in Paramecium, 253 



Cynoartathus, 580, 581 



Cyphonautes larva, 361 



Cyst, hydatid, 338; of liniamoeha histolyhca, 

 239; of Tnchinella, 353 



Cysticercu.s, 337, 338 



Cystoidea, 216, 486, 487 



Cytochrome transfer .system, 37 



Cytology, 173, 185-194 



Cytoplasm, 17 



Cytosome, 17, 38; constriction of, 43, 148; of 

 Amoeba, 230 



D substance, 164 



Dactylozooids, Physaha, 303 



Damsel Hies, 459 



Demons memppe, 466 



Darwin, Charles, 218, 611, 633, 636, 648 



Data, 4 



DD r, 477 



Deamination, 37, 78 



Death rate, 61 1 



Decapoda, 440, 441 



Decarboxylation, 37 



Deer, 580 



Deficiency, 205 



Dehydrogenation, 36, 37 



Delamination, 152 



Deletion, 205 



Demospongiae, 273 



Dendrites, 68, 96 



Dendracoelum, 316, 317 



Dentalium, 386, 387 



Dermal branchiae, 489, 516; and excretion, 521 



Dermal plates, of reptiles, 565 



Dermaslenas, 497 



Dermis, 61, 155 



Desmoneme, 290 



Desoxyribonucleic acid (DNA), 21, 21, 28, 

 39, 197 



Desoxyribose, 28 



Detorsion, of gastropods, 384 



Development, modification of, 165-169; of 

 amphibians, 149, 150, 155; of amphioxus, 

 147; of Antedon, 508; of Arbacia, 501; of 

 birds, 132, 150, 153, 154, 156; of chordates, 

 145-159; of crayfish, 436; of earthworm, 

 413; of fishes, 156; of Polyaordiiis , 418; of 

 starfish, 496; rate of, 167 



Devonian Period, and ancestors of sharks, 

 557; and chordate remains, 540; and earlv 

 fishes, 555, 557; climatic conditions in, 557, 

 562 



Diabetes mellitus, 84. 120 



Diapause, in locust eggs. 454 



Diaphragm, 56, 102, 124 



Dibranchiata, 388 



Dicyemida, 270, 271 



Didelphys virgimana, 583 



Didimum, 257; as predator of Paramecium, 613; 

 population dynamics of, 612, 613 



Diencephalon, 87, 102, 103 



Diffluoia, 236 



Difi^usion, 74. 81, 84; and ayailabilit\' of water. 

 601 



Digamctic sex. 210 



Digenea, 328, 329 332 



Digestion, 70-74, 73; in Anuieba, 234; in 

 Hydra, 292; in Paramecium, 253; in pla- 

 narians, 3 1 7 



686 



