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bulletin: museum of comparative zoology. 



Sea, August, 1903. Most of the volumes per cubic meter given by 

 Apstein are not for the whole column of water, but for parts of it only, 

 as given by closing nets ; to make them directly comparable with the 

 Grampus hauls, the entire depth at each station must be taken into ac- 

 count. When this is done, the average per cubic meter, for the North 

 Sea, is about 9.1 cc; the average for the Gulf of Maine 1 CC.-1.3 cc. 

 Copepods were much more numerous in the North Sea than in the 

 Gulf, the average of fourteen hauls in the Gulf of Maine in August, 

 1913, being about 66000 under each square meter of surface; the aver- 

 age in the North Sea August, 1903, about 1,000,000 (Apstein, 1906; 

 Johnstone, 1908). And although Calanus is present in large numbers 

 in the Gulf, it was never found in such swarms as occur in the southern 

 part of the Norwegian Sea, where a surface haul of five minutes dura- 

 tion with a meter net may }ne\d more than a litre of Calanus (Damas, 

 1905, p. 15). 



TABLE OF STATIONS, NETS USED, DEPTHS OF HAULS IN 

 FATHOMS. 



Nets. 



A = Albatross 4 ft. net. B = 24 cm. net ^ 20 silk. C = 36 cm. net ^ 3 silk 

 F = Young fish trawl. H = Helgoland net. S = Michael Sars 1 meter net. 

 Q = Quantitative net. T = Otter Trawl. Italics indicate "no bottom." 



