. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Textfigs. 160—16.^. Cribrina spetsbergensis. Transverse sections of tentacles (figs. 160, 161), of oral disc (fig. 162) and of sphinc- ters (figs. 163—164). (Fig. 160 spec, from St. 52 Olga-Exp.; figs. 161, 163 spec, from Vega-Exp.; fig. 162 spec, from St. 67 M. Sars-Exp.; fig. 164 spec, from St. 41 Olga- Expedition).. Fig. 163 pinnate and palmate type we may consider the spliincters of a specimen from the station 52 (Olga-Exp.) and of an individuum from New Foundland. In the former there
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Textfigs. 160—16.^. Cribrina spetsbergensis. Transverse sections of tentacles (figs. 160, 161), of oral disc (fig. 162) and of sphinc- ters (figs. 163—164). (Fig. 160 spec, from St. 52 Olga-Exp.; figs. 161, 163 spec, from Vega-Exp.; fig. 162 spec, from St. 67 M. Sars-Exp.; fig. 164 spec, from St. 41 Olga- Expedition).. Fig. 163 pinnate and palmate type we may consider the spliincters of a specimen from the station 52 (Olga-Exp.) and of an individuum from New Foundland. In the former there is a very thick main lamella, but not so long that we may regard the sphincter as palmate, in the latter the main lamella is thin at the base, but much expanded inwards and forming a thick irregular triangle. In the sphincter, reproduced on the textfig. 163, streaks of muscle meshes are seen in some places. Such mesogloeal streaks in the sphincters indicate that parts of the mesenteries have been sectioned. All endodermal sphincters as well as the endodermal muscles in common become mesogloeal at the moment when they break through the mesenteries. The ectoderm of the tentacles is high and contains numerous nematocysts and very numerous spiro- cysts. The size of the nematocysts in the tentacles and in the actinopharynx and of the spirocysts in the tentacles is seen from the following table, in which also the number of tentacles and pairs of mesenteries and the distribution of the reproductive organs on the directives are stated. 20 The Ingolf-Expedition. V. 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
