. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. act Fig. 30. Fig. 31. Figs. 30—31. Hvbocodon prolifey. Transversal sections of mouth tube. — Fig. 30. Section passing (a little awry) through the ectodermal ring of nematocysts. — Fig. 31. Section through the zone of nematoblasts in the endoderm. n. ncmatocyst in the ectoderm. — Specimen from Nyborg, Denmark. — X i8o. Fig. 32. Hyhocodon prolifer. Transversal sec- tion of female manubrium, middle part. The stomach is dilatated by a copepod; this is left out in the figure, but the outl
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. act Fig. 30. Fig. 31. Figs. 30—31. Hvbocodon prolifey. Transversal sections of mouth tube. — Fig. 30. Section passing (a little awry) through the ectodermal ring of nematocysts. — Fig. 31. Section through the zone of nematoblasts in the endoderm. n. ncmatocyst in the ectoderm. — Specimen from Nyborg, Denmark. — X i8o. Fig. 32. Hyhocodon prolifer. Transversal sec- tion of female manubrium, middle part. The stomach is dilatated by a copepod; this is left out in the figure, but the outlines of its body are clearly reproduced in the contour of the endodermal epithelium of the medusa. — 00c. oocytes. — 0. large syncytial egg, which has withdrawn its marginal lappets aud become nearly spherical; the egg is still surrounded by the ectodermal epithelium of the manubrium; no trace of cell-formation; very iine blebs are uniformly distributed in the plasma; the egg has apparently ceased devouring its neighbours. — act. young acti- part of the manubrium the vesicular endoderm is separated from the nula, still without traces of tentacles; ecto- dermal epithelium completely developed; supporting lamella complete, though extre- Stance (see the longitudinal section, textfig. 2g), accordingly the upper mely thin at the proximal end; the endo- derm begins to differentiate, but no epi- end of the manubrium is surrounded by a gelatinous ring with flaring thelial cells are vet formed; in the middle cells nearh' destitute of protoplasm ("chorda cells"); but there is no shaqD limit between the latter and the ordinary epithelial cells of the middle part of the manubrium; the lowermost "chorda cells" still contain some remains of protoplasm, as seen in the longitudinal section (textfig. 29). The dorsal epithelium of the .stomach is shaped like a highly prominent plug composed of very high and narrow cells containing a great amount of protoplasm.
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
