874 



Index 



Holocentrus, erythrophores in, 711 

 Holometabolous insects, 732 

 Holothuria, light sensitivity in, 382 

 Homarus vulgaris, body fluids in, 91 

 Homoiosmotic animals, 14-20 



definition, 8 

 Homoiothermism, 240-244 

 Homoiothenns, acclimatization in, 348 



body temperatures in, 362 



development of, 363 



lethal temperatures in, 362 



temperature relations in, 361-370 



variations in, 361 

 Homostrophic reflex, 508 

 Honeybee, brain in, 817 

 HormoneCs), bird migration and, 766 



carbohydrate metabolism and, 757 



Cn-f , 730 



color changes in crustaceans and, 698 



coloration and seasonal color changes 

 and, 765 



developmental, in insects, 733 



digestive, 156 



effects on water and salt balance, 760 



follicle-stimulating, 741 



gastrointestinal coordination and, 762 



GD, in insects, 733 



gene, 729 



general considerations, 767 



general maintenance and metabolism 

 and, 756-761 



gonadal, 742 



growth and differentiation and, 726-740 



in color changes in fish, 709 



inhibitory, 733 



lactogenic, 748 



luteinizing, 741 



molt-inhibiting, in crustaceans, 739 



molting, 733 



Palaemonetes lightening, 698 



pigment-cell activities and, 763-766 



pituitary, affecting color changes in 

 amphibians, 704 



pupation, 735 



retinal pigment, 764 



sex and reproduction and, 740-756 



specificity in, 768 



V+,729 

 Horseshoe crab. See Limulus. 

 Humidity, effect on color change, 684 



effect on water balance in insects, 56, 57 



receptors in insects, 57 



sensitivity to in insects, 453 

 Hydra, osmoregulation in, 35 

 Hydrogen ion concentration, amoeboid 

 movement and, 636 

 effect on ciliary activity, 649 

 effect on oxygen tension, 315 

 minimum oxygen tension and, 249 

 of body fluids, 80, 81 



Hydrogen ion concentration of digestive 



fluids, 151-155 

 Hydrostatic pressure, responses to, 509 

 Hydroxyproline, structural formula, 119 

 Hymenoptera, body temperature in, 355 

 Hypermetropia, 395 

 Hypertensin, 761 

 Hypertensinogen, 761 

 Hypertonicity, definition, 6 

 Hypophysis. See Pituitary. 

 Hypothalamus, effect on reproductive 

 cycle, 751 



functions of, 834 

 Hypotonicity, definition, 6 



Illumination, intensity of, and fre- 

 quency of nerve impulse discharge, 432. 



See also Light. 

 Image, apposition, 390, 392 



formation in compound eye, 389 



mosaic, 391 



superposition, 390, 392 

 Imido-proteinase, 159 

 Immunological specificity of proteins, 105 

 Incus, 473 



Inhibition in nerve transmission, 803 

 Inorganic ions, 75-102 

 Inositol, 130 

 Insects, aquatic, osmoregulation in, 33 



blood pressure in, 541 



blood proteins in, 104 



body temperature of, 353 



chemoreception in, 450 

 behavior and, 452 



chemoreceptors in, 451 



cholesterol requirements in, 134 



chromatophores in, 680, 691 



digestive tract muscles in, 607 



eye in, 387, 388, 390, 391 



fat digestion in, 177 



flying, orientation in, 523 



ganglionic reflexes in, 814 



gills in, 215 



gonadotropic hormones in, 754 



heart in, 551 



heat absorption in, 356 



hemimetabolous, 732 



holometabolous, 732 



humidity sensitivity in, 453 



ionic concentration in, 77 



leg movements in, 814 



luminescence in, 663 



metabolic heat in, 355 



molt, pupation and metamorphosis in, 

 732 



motor innervation in, 601 



nitrogen excretion in, 194, 199 



nitrogen requirements, 120 



olfaction in, 461 



osmoregulation in, 55 



