206 



Index 



Phy SCO soma, 96 



P. lurco, 60 

 pinnipeds, 14 



invade sea, 44 

 plankton, 19 



as food, 57, 83 

 plants, origin, 11 

 Pldtdnistd gangeticd, 27 

 Plethodon, reproduction, 132 



respiration, 106 

 poikilosmotic animals, 95, 116 

 poikilothermic, animals, 82, 84, 101, 

 123, 124, 147 



insects, 122 

 Polistotremd stouti, 41 

 polychaetes (see also annelids and 

 worms) 



gill cavities, 98 



in Ganges delta, 27 



locomotion, 126 



marine, 93 



on land, 16 



senses, 128 

 polyhalinophil animals, 29 

 Pontoporeid, 42 

 pools, 32 



drying up, ^7 



in beaches, 43 



temporary, 17 



unstable, 92 



variability, 36 

 potamogetons, 32 

 Potdtnon, reproduction, 134 



respiration, 109 

 Potamonidae, 28 

 potassium, in sea water, 4, 73, 77, 



114 

 Praunus flexuosus, 29 



prawns, in Ganges delta, 27 

 pressure, in zonation, 55 

 Protopterus, metabolism, 123 

 protozoans (see also ciliates, flagel- 

 lates, Pdrdtnecium) 



all aquatic, 93 



cell membranes, 115 



parasites, 140 



salt toleration, 71 

 Pugettid quddridens , blood salinity, 



113 

 pumpkinseed, activity, 90 



rats, metabolism, 122 

 relict fauna, 27 

 _ in caves, 39 

 repbpulation, of islands, 46 



of bare rocks, 51 

 reproduction, 61, 130 



changes, 143 



parthenogenetic, 131 



viviparity, 134 

 reptiles, body fluids, 76 



excretion, 129, 130 



gill arches, 9 



in deserts, 16 



lungs, 110 



metabolism, 101 



migrate to sea, 10, 14, 44 



respiration. 111 



teeth, 137 

 resistance, 69 

 respiration, 58, 100 



air-breathing flshes, 105 



in fresh water, 99 



in sea water, 73 



organs, 141 



rate, 77 



