. 5 20 M^_- 9/a 5% 22 15 6^ B'k. 17 9/2 3'A Fig. 30. The distribution of Dactyliosolen laevis. South Georgia survey, November 1930. i = one hundred thousand. maximum development for this survey in the western Weddell Sea water to the south and south-west of the island. Many more might be cited from the less numerous forms, for example Nitzschia sp. A, a minute colonial form closely resembling the N. rigida of northern waters. On this second survey two series of water samples for examination by means of the centrifuge were taken. The first of these was at St. 483, where analysis of the net haul
. 5 20 M^_- 9/a 5% 22 15 6^ B'k. 17 9/2 3'A Fig. 30. The distribution of Dactyliosolen laevis. South Georgia survey, November 1930. i = one hundred thousand. maximum development for this survey in the western Weddell Sea water to the south and south-west of the island. Many more might be cited from the less numerous forms, for example Nitzschia sp. A, a minute colonial form closely resembling the N. rigida of northern waters. On this second survey two series of water samples for examination by means of the centrifuge were taken. The first of these was at St. 483, where analysis of the net haul had shown the phytoplankton to be poorer than anywhere else on the survey, with Corethron valdiviae completely dominant. From the centrifuged samples it was esti-
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