. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 132 HYDROIDA II one the impression that only the extreme â and thus latest developed â gonothecse on the branches can lack one or the other of the distal spines. This is different from what we find in Sertularia cu- pressiua, where the variants are distributed throughout the whole of the branch, without any distinctly demonstrable regularity. Nntting (1904 p. 71) who mentions the fact that the gonothecee in Sertu- laria Fabricii do vary, has not gone into the question of detail. The recent assignment of a previously undeterm
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 132 HYDROIDA II one the impression that only the extreme â and thus latest developed â gonothecse on the branches can lack one or the other of the distal spines. This is different from what we find in Sertularia cu- pressiua, where the variants are distributed throughout the whole of the branch, without any distinctly demonstrable regularity. Nntting (1904 p. 71) who mentions the fact that the gonothecee in Sertu- laria Fabricii do vary, has not gone into the question of detail. The recent assignment of a previously undetermined specimen from the Kara Sea to Sertularia Fabricii suggests that we have here a circumpolar species, capable of penetrating somewhat down into the boreal areas. Further investigations will probably show the species to be more common in arctic waters than would appear from the data on record. Sertularia Fabricii doubtless belongs, strictly speak- ing, to the littoral region, but can, as shown by the finds at "Ingolf" St. 2, 3, and 4, also move some way down into the abyssal. The species has previously been recorded from Alaska and Puget Sound. Within the area investigated (fig. LXX) it is noted from West Greenland, Jan Mayen, and the submarine ridges between Iceland and the Faroe Islands, where the fauna is of a mixed character. Sertularia (?) tubuliformis (Marktauner-Turneretscher) Levinsen. 1890 tubuliformis, Marktanner-Turneretscher, Die Hydroiden des k. k. naturhistorischen Hof- museums, p. 238. 1904 Thujaria tubuliformis, Nutting, Sertularidse, p. 70, pi. n, figs. 1â8. 1913 Sertularia tubuliformis, Levinsen, Systematic Studies on the Sertulariidae, p. 298. Upright pinnate colonies with alternating branches. The main stem has, on each internodium, on one side a branch and two hydrothecse, on the other a hydrotheca. The branch has in most cases minor branchlets oppositely placed, and is divided by di- stinct segmentation into iuter- nodia, bearing t
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