198 



Index 



in zonation, 55 



on beaches, 22, 69 



resistance to, 87, 96 



resistant algae, 21 



subterranean, 37 

 desmids, in plankton, 57 

 Devil's Lake, South Dakota, 44 

 diatoms, 19 



in plankton, 57 



in saline pools, 34 

 dilution, resistance to, 55 



of sea water, 30, 41 

 dinosaurs, locomotion, 79 

 Diplodus sargus, 44 

 Diptera (see also chironomids) 



in caves, 40 



in sea, 31 



in soil, 39 



invasion of ponds, 14, 43 



salt resistance, 72 

 distomes, as parasites, 141 

 diurnal animals, energy, 90 

 dolphins, in estuaries, 26, 27 

 dragonfly, eyes, 127 



larvae in saline pools, 45 



nymphs, 36 



nymphs in saline pools, 72 



tropisms, 139 

 Dreisensidae, 31 

 Drilocrius, respiration, 109 



earthworms, 38, 39 (see also oligo- 

 chaetes) 

 body fluids, 76 

 in soil, 93, 96 

 integument, 99 

 on Krakatao, 46 



Echinarachnius, reproduction, 131 



salt toleration, 75 

 echinoderms (see also starfish, holo- 

 thurians) 

 body fluids, 41 

 boring, 38 

 haemoglobin, 120 

 in ocean, 13, 93 

 echiuroid, in Ganges delta, 27 

 eel, air-breathing, 60 



conger, respiration, 114 

 development, 61 

 euryhaline, 97 

 reproduction, 131 

 eel grass, 32 

 Eider River, 44 



dasmobranchs, 7 (see also fishes) 

 ^ blood, 8 



body fluids, 76 

 excretion, 130 

 osmotic swelling, 78 

 reproduction, 133 

 Elbe River, 28 

 electrolytes, in water, 75 

 elephants, locomotion, 79 

 emigration (see also migration) 

 causes, 49 

 incentives, 49 

 Endamoebd, as parasite, 141 

 enemies, on beaches, 22 

 energy, from sun, 15 



radiant, 89 

 Enteromorpha, beach zone, 19 



E. intestinales 34 

 ephemerids, larvae, 96 

 ephydrid flies, larvae in brine, 70 



larvae in Great Salt Lake, 45 

 Epistylis, parasitic on crabs, 67 



