. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. HYDROIDA II H3 in the material from the cruise of the "Dijmphna" in the Kara Sea, but has there erronously been referred either to Thujaria lonchitis or Thujaria articulata. From its arctic home, the species also spreads out into the boreal region (fig. hXXYII) where it has been recorded from the Faroe Islands and Iceland, and in Davis Strait. It will presumably also be found to occur off the coast of Norway, but in these waters, it has not hitherto been distinguished from Thujaria lonchitis. so that we have no rel
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. HYDROIDA II H3 in the material from the cruise of the "Dijmphna" in the Kara Sea, but has there erronously been referred either to Thujaria lonchitis or Thujaria articulata. From its arctic home, the species also spreads out into the boreal region (fig. hXXYII) where it has been recorded from the Faroe Islands and Iceland, and in Davis Strait. It will presumably also be found to occur off the coast of Norway, but in these waters, it has not hitherto been distinguished from Thujaria lonchitis. so that we have no reliable data up to the 2 00 m. boom. looo m. Fig. LXXVII. Finds of Thujaria laxa in the Northern Atlantic. 2 ooo m. Thujaria alternitheca Levinsen. 1893 Thujaria alternitheca, Levinsen, Meduser, Ctenophorer og Hydroider, p. 52 pi. 7, figs. 15—20. Robust, upright colonies with spiral, monosiphonic stem. The stem is divided by distinct seg- mentation into internodia of varying length, and has two single spiral tiers of hydrotheca;: there are from 3 to 6 hvdrothecae between two successive branches in the same spiral, the lowest in the branch corner. Normally, the sixth branch will be found straight above the first in the same tier. The broad plane of the branches is perpendicular to the axis of the stem (lies horizontally) and the branches form, at their point of origin, almost a right angle with the stem, afterwards curving somewhat downwards; they are secondarily branched dichotomously, and divided into internodia with five or more pairs of hydrothecee. The hydrothecse of the branches form two very close longitudinal rows; the hydrothecse are closely set, each thrusting its opening part out upwards and sideways beyond the next, displaced alternatelv to either side of the median line through the base of the hydrothecse, presenting a distinct approach to quadriserial arrangement. The hydrothecse are entirely imbedded in the stem and bran- ches, without anv free distal pa
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