Index 



201 



Grapsus, respiration, 109 



G. grapsus, blood salinity, 113 

 grasses, in swamps, 32 



migrate to sea, 10 

 gravity, affecting migration, 79 

 grunion, egg-laying, 66 

 Gunda ulvae, salinity, 116 



habitats, land, 13 

 water, 13 



haemerythrin, in blood of gephyre- 

 ans, 121 



haemocyanin, in blood, 120 

 in mollusks, 102 



haemoglobin, in blood, 102, 120, 

 123 



hagfish, body fluids, 41 



hemicraniotes, 95 



Hemigrapsus sanguineus, blood sa- 

 linity, 113 



Hemiptera (see also bugs, water 

 striders) 

 invasion of ponds, 14, 43 



Heterophytidae, 67 



holothurians, in Thames estuary, 28 



homoiosmotic animals, 61, 77, 95, 

 116 

 vertebrates, metabolism, 101 



homoiothermic animals, 124, 139, 

 147 



Hoplophryne, respiration, 107 



horses, light requirements, 90 



hot springs, fauna, 83 



humidity on beaches, 20 



hyacinths, water, 15 



Hyas, blood, 117 



H. aranea, weight changes, 119 



hydras, in fresh water, 64 



hydrogen, 6 



hydrogen sulphide, sensitivity to, 



59 

 hydroids, in Ganges delta, 27, 28 



resistance to dilution, 55 



succession, 52 



toleration ranges, 69 

 hydrotactic animals, 95 

 hydrozoans, toleration ranges, 69 

 hypertonic media, 75, 118 

 hypotonic media, 75 



Idothea baltica^ 30 



/. viridis, 30 

 Ilyanassa, in dry air, 86 

 llyoplax, respiration, 109 

 insects (see also apterygotids, 



caddis-fly, dragonfly, may- 

 flies, mosquitoes, etc.) 



absence from sea, 73 



apterous, in soil, 39 



apterygotids, 38 



blood-gills, 102 



chlorophyll, 121 



clothes moth, ^% 



CO2 poisoning, 59 



distribution, 146 



dominant, 94 



energy, 91 



exoskeleton, 97 



haemoglobin, 120 



hibernating, 85 



in deserts, 16 



in pools, 22 



intertidal, 20 



invasion of ponds, 14 



meal-worm larva, B>% 



metabolism, 101, 122 



