. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA II 143 in the material from the cruise of tlie "Dijmplina" in the Kara Sea, but has there erronously been referred either to Thujaria loiicliitis or Tliiijaria articidata. From its arctic home, tlie species also spreads out into the boreal region (fig. LXXVII) 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 fro

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. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA II 143 in the material from the cruise of tlie "Dijmplina" in the Kara Sea, but has there erronously been referred either to Thujaria loiicliitis or Tliiijaria articidata. From its arctic home, tlie species also spreads out into the boreal region (fig. LXXVII) 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 fro Stock Photo
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. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA II 143 in the material from the cruise of tlie "Dijmplina" in the Kara Sea, but has there erronously been referred either to Thujaria loiicliitis or Tliiijaria articidata. From its arctic home, tlie species also spreads out into the boreal region (fig. LXXVII) 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 fro
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. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA II 143 in the material from the cruise of tlie "Dijmplina" in the Kara Sea, but has there erronously been referred either to Thujaria loiicliitis or Tliiijaria articidata. From its arctic home, tlie species also spreads out into the boreal region (fig. LXXVII) 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 lonchifis, so that we have no reliable data up to the present.. 200 m. 600/n, looom. Fig. LXXVII. Finds of TIiKJana laxa in the Northern .Atlantic. Thujaria alternitheca Levinsen. 1893 TliKJana alternitheca, Levinsen, Meduser, Ctenophorer og H\droider, 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 hydrothecte; there are from 3 to 6 hydrothecse 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 a.xis of the stem (lies horizontalh') 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 hydrotheccc. The hydrothecEe 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 alternately to either side of the median line through the base of the h}-drothecse. presenting a distinct approach to quadriserial arrangement. The hydrothecse are entirely imbedded in the stem and b