. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fifr. 80. Oelineon tuericum. Transverse sertion of a retractor of a perfect nip^i-ntery in the region of the the part, in larger specimens the relation about 4:1. I counted about W mesenteries at the liasal in one specimen. Only the 8 "E"lwardsia" are macrocnemes and provided with filaments, acontia and reproductive organs, all other mesenteries are niicrocnemes. The folds of the retractors are. Fig. 81. Odineon suecicum. Inne
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fifr. 80. Oelineon tuericum. Transverse sertion of a retractor of a perfect nip^i-ntery in the region of the the part, in larger specimens the relation about 4:1. I counted about W mesenteries at the liasal in one specimen. Only the 8 "E"lwardsia" are macrocnemes and provided with filaments, acontia and reproductive organs, all other mesenteries are niicrocnemes. The folds of the retractors are. Fig. 81. Odineon suecicum. Inner part of the sixth couple of mesenteries. tors than in that figured (fig. 80). .\part from the retractors the longitudinal of the "; are missins or, if present, at any rate very weak; on the opposite side of the retractors the muscles are clearly visible, forming a distinct layer and terminating, at least sometimes, as a fold running out from the main lamella of the mesenteries. The description of indicates that the form folds in a similar manner in O. Undiihli, but whether this fold is so deep, that it forms a distinct lamella is questionable, as the figures 14-17 PI. 30 are difficult to interpret; an offshoot in the mesentery drawn in fig. 14 may possibh' be a similar fold. A clo-ser examination is desiderable. The imperfect mesenteries of the .5th and tith couples, forming pairs with the lateral "Edwardsia"-mesenteries, have no distinct retractors but their free borders have rather numerous longitudinal muscle folds, stronger on the 5th couple than on the 6th (fig. 81). On the endocoel sides the muscles are missing or, at any rate, if present, very weak, on the opposite .sides, however, clearly visible. Thus, the correspon<ling to the parietobasilar are here developed. The mesenteries of the second cycle (figs. 79 b, c) agree with those of the 5th and 6th couples but are weaker and s
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
