Index 



869 



Crustaceans, eye in, 388 



fresh-water, 29 



giant fibers in, 788 



gills in, 214 



ionic concentration in, 86 



male hormone in, 752 



marine, 29 



molting in, 737 



motor innervation in, 596 



nervous regulation of hearts in, 558 



nitrogen excretion in, 191, 192 



osmoregulation in, 20-33 



oxygen consumption in, 242 



oxygen withdrawal by, 251 



respiratory mechanisms in, 214 



respiratory response in, 265 



retinal pigment control in, 764 



uricolytic enzymes in, 203 

 Crystal structure of hemoglobins, 105 

 Ctenophores, cholinergic systems in mus- 

 cles in, 611 



luminescence in, 662 



statocyst of, 514 

 Cupula, 517 

 Curare, effect on muscle, 588 



neuromuscular transmission and, 612 

 Cutaneous sensation, 509. See also Skin. 

 Cyanea, osmotic adjustment in, 14 

 Cyanide sensitivity in relation to oxygen 



consumption, 233 

 Cyclostomes, ions in body fluids in, 83 



kidney in, 48 



osmoregulation in, 51 



photosensitive pigments in, 412 

 Cypridina, luciferin in, 668 

 Cysticercus tenuicollis, osmoregulation in, 



18 

 Cystine, structural formula, 119 

 Cystophora, blood changes in during 



diving, 260 

 Cytochrome, 294 



absorption spectrum of, 300 



Daphnia, eggs of, osmoregulation in, 20 



hemoglobin function in, 323 

 Dark adaptation, electrical measurement 

 of, 426 



in Mya, 406 



kinetics of, 415 



nerve impulse in, 432 

 Deaminases, distribution of, 201 

 Debt, oxygen, 274 

 Decibel, 472 



7-Dehydrocholesterol, 132 

 Delay, synaptic, 799 

 Dendrocoelum, osmoregulation in, 35 



photoreception in, 387 

 Depth perception, 401 

 Desert, water balance of mammals in, 60 

 Desiccation, prevention of in insects, 56 



Desoxycorticosterone, as progestin, 746 



effect on water and salt balance, 760 

 Deuteranopia, 437 

 Deutocerebrum, 818 

 Diabetes, effect of pituitary on, 758 

 Diencephalon, functions of, 834 

 Diet, restricted, 136. See also Nutrition. 

 Differentiation, growth and, hormones 



and, 726-740 

 Diffusion constants of oxygen, 210 

 Diffusion lungs, 219 

 Digestion, body region for, 147 



correlation with feeding habits, 178 



extracellular, 150 



fluids of, hydrogen ion concentration of, 

 151-155 

 stimulation of secretion, 155 



hormones and, 762 



intracellular, 150 



mechanical factors in, 147 



movement of food mass in, 149 



of carbohydrates, 168-176 

 age and, 176 



of fats, 176-178 



of proteins, 157-168 



site of, 150 

 Digestive tract. See Alimentary tract. 

 Dinitrophenol, stimulation of oxygen con- 

 sumption by, 238 

 Diopter, definition, 395 

 Dipeptidases, 159 



Dissociation curve, carbon dioxide, 329 

 Dissociation, oxygen, 306 

 Diurnal rhythms, color change and, 687 

 Diving, respiratory mechanisms in, 258 

 Dixippus, chromatophores in, 680 



color changes in, 692 



metamorphosis in, 734 

 Dogfish, nitrogen excretion in, 197 



spinal, behavior in, 822, 823 

 Dogs, olfactory sense in, 457 



spinal reflexes in, 826 



uric acid in, 205 

 Donnan equilibrium in ionic regulation, 90 

 Doris, osmotic adjustment in, 12, 13 

 Drosophila, gene hormones in, 729 



variations in oxygen consumption in 

 species of, 235 

 Drugs, effects on hearts, 559 



effects on visceral muscles, 606 

 Duodenum, hormones of, 762 

 Dytiscus tnarginatus, retinal action po- 

 tentials of, 427 



Ear, external, 473 

 function of, 477 

 in fish, 484 

 inner, 474 

 middle, 473 

 morphology of, 473 



