Archive image from page 279 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex5bpt5a8daniuoft Year: 1899-1953 128 HYDROIDA II The young colonies are always pinnate, the larger ones now pinnate, now with distally sinist- rorse stem. The stem itself is but slightly pronounced, if at all; it is monosiphonic and iudistinctly segmented, with almost regularly alternating branches. The branches again produce irregular, not infrequently alternating branchlets, which may further be tertially ramified. The pinnate portions of the colonies have the broad plane o
Archive image from page 279 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex5bpt5a8daniuoft Year: 1899-1953 128 HYDROIDA II The young colonies are always pinnate, the larger ones now pinnate, now with distally sinist- rorse stem. The stem itself is but slightly pronounced, if at all; it is monosiphonic and iudistinctly segmented, with almost regularly alternating branches. The branches again produce irregular, not infrequently alternating branchlets, which may further be tertially ramified. The pinnate portions of the colonies have the broad plane of the branches perpendicularly set; iu the spirally coiled ones, on the other hand, it is horizontal. On the same side of the stem, or in the same spiral, there are three very rarely two or four hydrothecse between two successive branches, the lowest in the branch corner. The branches are divided into irregular internodia with a varying number of hvdrothecse. The hydrothecse are subalternately to alternately placed; their plane of symmetry coincides, in the pinnate portions, with the broad plane of the branches, but is often mnch displaced in the spiral parts, so that the hydrothecse here often come very near to unilateral arrangement on the upper side of the branches. The hydrothecse are not very deeply imbedded, and have a highly diverging distal part; the free distal part of the adcauline wall is almost invariably more than half the length of the hydrotheca, and twice to three times the opening diameter. The maximal breadth is near the middle decreasing thence equally to either end. The aperture margin has two distinct somewhat rounded lateral teeth of equal size; the abcauline large lid plate has a large free distal part. Fig. LXVII. Sertularia te- wr-o. Part of a branch with a The gouothecse are attached to the branches close under tlie base of L Tr o '''i â¢' the hvdrothecre; in the spiral part always on the upper side of the branch. The the Kara bea, 'Dijmphna.
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Keywords: 1890, 1899-1953, archive, arctic_regions, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, copenhagen_h_hagerup, danish_ingolf_expedition_1895_1896_, drawing, historical, history, illustration, image, k_benhavns_universitet_zoologisk_museum, marine_animals_arctic_regions, page, picture, print, reference, scientific_expeditions, vintage
