. G si CD 35* Fig. 18. Distribution of Thalassiosira antarctica round South Georgia in the December-January 1926-7 survey. For full explanation see legend of Fig. 16. Its abundance on the November C line cannot be judged from the N 70 V nets (the N 50 V nets not being used), since all but a few usually pass through their meshes. However, it may be mentioned that at St. 20 in this line 22,800 were recorded in the N 70 V nets (100-0), which is the second highest figure for Corethron occurring in the analyses of these nets. At Sts. 131 and 132, where the N 50 V nets gave 3,216,000 and 1,003,500 r
. G si CD 35* Fig. 18. Distribution of Thalassiosira antarctica round South Georgia in the December-January 1926-7 survey. For full explanation see legend of Fig. 16. Its abundance on the November C line cannot be judged from the N 70 V nets (the N 50 V nets not being used), since all but a few usually pass through their meshes. However, it may be mentioned that at St. 20 in this line 22,800 were recorded in the N 70 V nets (100-0), which is the second highest figure for Corethron occurring in the analyses of these nets. At Sts. 131 and 132, where the N 50 V nets gave 3,216,000 and 1,003,500 respectively, the N 70 V nets gave only 740 and 450. It would appear that this diatom was at any rate fairly abundant in November; but this is all we can say, since no true relation can be established between the N 70 V nets and the N 50 V nets in regard to this diatom on account of its usual passage through the meshes. It may well
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