. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 66 ACTIXIARIA o\' oiK-fiitnitod in papillae, it is qui'stion- »bl-, really is proviiled with teim- culi. In the upper part of the scapus the ectoderm is oft*ii not c|,-. ' ' ' ' ' ^Iv represented only by the gland-cells, which si.: -'untiniiuus layer (tif». 78). Such {^land-cells ar 11 the niesofjloea and espec-ially in the endoderni of • ;. where they form an almost continuous layer at the base of the endoilerni. Also in the endoderni of the mesenteries thev are situat«tl in a s
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 66 ACTIXIARIA o\' oiK-fiitnitod in papillae, it is qui'stion- »bl-, really is proviiled with teim- culi. In the upper part of the scapus the ectoderm is oft*ii not c|,-. ' ' ' ' ' ^Iv represented only by the gland-cells, which si.: -'untiniiuus layer (tif». 78). Such {^land-cells ar 11 the niesofjloea and espec-ially in the endoderni of • ;. where they form an almost continuous layer at the base of the endoilerni. Also in the endoderni of the mesenteries thev are situat«tl in a similar manner. Probably we have to do with waiiilering cells, as the gland-cells of the mesogloea sometimes rvach into the endotlerm. , having not seen any ectoderm iu the .scapus of liiulahli (in opposition to ), suggested "that the secretion( ?) of mesogloea for the ailhesion of the .sand" (in this species) "is effected by wandering cells from the endoderni, but I have not been able to detect their presence". Whether there reallv are wandering cells in limlahli I cannot confirm owing to the poor preservation of the specimens, but in siiecicum such wandering cells may be |» The sphincter is mesogloeal and rather strong, its muscle meshes small and wholly separated from the circular muscles of the column. Whether the sphincter in the expanded .state of the animal has the .same extension as in liiitlahli, I have not been able to ascertain, as the mesogloea in the region of the sphincter was very thickened owing to strong contraction. The ectoderm of the scapulus, tentacles and oral is of usual appearance, that of the actinopharynx, apart from that in the ridges, considerably thicker than the thin mesogloea. The mesenteries are more numerous in the ])roxiiiiaI than in more robust and more numerous, at least in older specimens (fig. 7;i a) than of O. limlahli, .sometimes the pennons showed a tendency to be divided into
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
