Organization, simple 455 

 Organochloride residues 229 

 Organophosphorus compounds 532 

 Organs, autonomous 1250 

 Orientation 1722 



, parallel 419 



Origin 854, 1381, 1428 



Orleans, Mass. 152, 203 



Ornithine 769 



Orrs Cove, Me. 493, 1360 



Orthodichlorobenzene (OD) 436, 454, 1149, 1152 



Orthophosphate 554 



Oscillogenic action 710 



Osmometry 1200 



Osmoregulation 27, 31, 849, 852, 877, 1682, 2123 



Osmoregulatory function 6 36 



Osmotic adjustment 744 



concentration/osmoconcentration 31, 571 



reaches critical level, when external 1664 



equilibrium 1555 



pressure 372, 635, 1663, 1807 



properties 1265 



regulation 809, 872, 1555 



shock 2128 



stress 571 



Ostend Harbour, Netherlands 824, 953 



Ostracoda 2027 



Ostrea 109, 200, 369, 555, 610, 628, 821, 943, 978, 1400, 1427, 1557, 1636, 1927, 

 1939, 2042 



Ostreasterol 898 



Ostrinoola 320, 882, 2094 



Ouabain, insensitive to 2108 



Outbreaks, first in U. S. 157 



Outcompeting 400 



Ova 142 



, smaller 189 



, unfertilized spawned 189, 190 



Ovalipes 1734 



Overboard 164 



Overcrowding 54, 663, 1145 



Overfishing 150, 152, 469, 575, 606, 666, 1213, 1219 



, danger of 801 



Overharvesting 666, 964, 973, 974, 1214, 1216 

 Ovocytes and presence of spermatozoa, previtellogenic 1171 



_ _ spermatocytes, previtellogenic 1171 



with vitellus and presence of spermatozoa 1171 



, young 1102 



Ovogenesis 83 



760 



