. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 70 CTENOPHORA. observations is doubtless this, that his supposed specimens of PI. rhodopis are not this form at all, but most probably belong to some species of Lobatae. This suggestion is supported by the fact, that in Garbe's material of young Pleurobrachia from Helgoland were found a pair of specimens showing essentially the same structure of the gastrovascular system as his "; from Triest. Now it can be said with rather great certainty, that these latter young Cten
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 70 CTENOPHORA. observations is doubtless this, that his supposed specimens of PI. rhodopis are not this form at all, but most probably belong to some species of Lobatae. This suggestion is supported by the fact, that in Garbe's material of young Pleurobrachia from Helgoland were found a pair of specimens showing essentially the same structure of the gastrovascular system as his "; from Triest. Now it can be said with rather great certainty, that these latter young Ctenophores from Helgoland can only be young Bolinainfiindibuhdii^ the only other tentaculate Ctenophore occurring here besides It is in good accordance herewith, that the costse are placed very close together, as is characteristic of the young Bolina (which was even named Cydippc qiiadricostata by Sars on account of this pecu- liarity). — I think then that there can be no doubt that Garbe's Pleiirobrachia rlwdopis is really the young of some species of Lobatas (evidently not Bolina, since the specimens from Triest differ in some points from those from Helgoland). The mistake is not to be wondered at very much, it being in fact a very difficiilt matter to distingiiish such very young specimens of Lobatse from true Cydippids. Garbe's observations thus cannot disprove the'identity of PI. rhodopis with PL pilcns, which I think has been conclusively Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Danish Ingolf-Expedition (1895-1896); Københavns universitet. Zoologisk museum. Copenhagen H. Hagerup
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
