. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fig. 28. Sagnrtii>yloii vidiiatuf. .Section of a rinclis at the limbiis. tions of the ecto<lerm, though the evapinafion from the endoderm here are stronger than in the upjier cinclides. 1 cannot decide with certainty if the ecfo«leriiial channel continues in the endodermal one. though there are hint« of it in some sections (textfig. 28). At any rate we have to do at least with praeformed cinclides. In the ect<Mlerm of the column sometimes encysted parasites, probably gregarines, o
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fig. 28. Sagnrtii>yloii vidiiatuf. .Section of a rinclis at the limbiis. tions of the ecto<lerm, though the evapinafion from the endoderm here are stronger than in the upjier cinclides. 1 cannot decide with certainty if the ecfo«leriiial channel continues in the endodermal one. though there are hint« of it in some sections (textfig. 28). At any rate we have to do at least with praeformed cinclides. In the ect<Mlerm of the column sometimes encysted parasites, probably gregarines, occur (texttig. 29). They were situated about in the middle of the ectoderm or somewhat approached to the mesogloea. As in other species of Sagartioijeton the younger mesenteries grow from the base upwards as well as from the margin downward, but the mesenteries at the base seem to arise a little earlier than those. Fig. 29. Sagartiogeton viduatus. Encysted Gregarines in the ectoderm of the column. at the margin. The retractors of the non-directives are band-like, in the directives concentrated and in the region of the actinopha- rynx situated to it. The acontia are thick. The sj)ecies is {lioecious, the male and female gonads are ripe at the end of .June in Rohusliin. The species never propagates asexually, but pieces of the part regenerate easily (see Carlgren 1904,1909). Remarks: The species is not identical with Sagarlia i-iduafa of GossE (see also Stephexsox 1935 p. 357). Also the .species mentioned by Schulze (1875), Hartlauh (1894) and Pax (1928) from Helgoland is not our species but anguicomus. The liduala too from Bulk (. 1873) and from other coasts of Geriiiaiiv is proi)ai)ly not this species. This is also the case with the species mentioned by ( 1844 and Lutkex 1861 from the Sound. It is, however, possible that viduatus at these times was present there because w^e must always take into account that the fauna has changed from time to time i
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
