. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA II 97 the species, with the marsupial chamber resembling that of Diphosia fullax (Johnston) and Diphasia rosacea (Linne) have led to its being freqnenth- referred to this genus. The state of the material did not permit of a quite certain investigation of the polyps, but as far as it was possible to judge it has a quite rudimentary blind sack, which brings the species nearer to Diphasia. On the other hand, the closing apparatus is altogether of the same type as Sertularella., thus
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA II 97 the species, with the marsupial chamber resembling that of Diphosia fullax (Johnston) and Diphasia rosacea (Linne) have led to its being freqnenth- referred to this genus. The state of the material did not permit of a quite certain investigation of the polyps, but as far as it was possible to judge it has a quite rudimentary blind sack, which brings the species nearer to Diphasia. On the other hand, the closing apparatus is altogether of the same type as Sertularella., thus removing tlie species again from Dipliasia. The most natural thing would doubtless be to consider Serlularella tamarisca as the type of a distinct genus, which in a certain degree forms a link between the true Scrlnlaria species and Diphasia. This would demand, however, in the first place a closer study of the structural. 2 00 rrt. .___.^oom ,_ i quo m. ,_ , .^.. 2 ooo m. Fig. LI. The distribution of Serlularella tamarisca in the Nortliern Atlantic. In the hatched regions the literature notes a scattered occurrence without giving particular data. conditions of the species, and as my material is not suited to the purposes of such investigation, I have for the present refrained from establishing the new genus here. It is not altogether easy to determine witli certainty the biogeographical character of the species. Sertnlarclla taviarisca is not a form of frequent occurrence, and is never met with in large numbers at a time; on the contrary, it is as a rule taken in single specimens, so that the species appears to be somewhat of a raritw Further study seems to show that it is a boreal species capable of penetrating slightly into the arctic area and even more into warmer waters. Towards the north, it comes up into the White Sea, and towards the south, as we know, it penetrates into the Mediter- ranean. In the waters investigated (fig. LI) the species has not infrequently been found
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
