Archive image from page 13 of The Danish Ingolf-Expedition (1914). The Danish Ingolf-Expedition danishingolfexpe0505ingo Year: 1914 STYLASTERIDAE which the stolons emerge. Examination of serial sections seems to suggest, that the endoderm in the basal part itself is strongly vacuolated; but this may also be due to the imperfect state of preserva- tion. The protoplasm is here strongly granulated and all indicates, that the albumen cells (cf. Schneider 1902 p. 579) form the principal mass of the endoderm in the basal part of the polyp, whilst the nutriment cells are in majority in the endod
Archive image from page 13 of The Danish Ingolf-Expedition (1914). The Danish Ingolf-Expedition danishingolfexpe0505ingo Year: 1914 STYLASTERIDAE which the stolons emerge. Examination of serial sections seems to suggest, that the endoderm in the basal part itself is strongly vacuolated; but this may also be due to the imperfect state of preserva- tion. The protoplasm is here strongly granulated and all indicates, that the albumen cells (cf. Schneider 1902 p. 579) form the principal mass of the endoderm in the basal part of the polyp, whilst the nutriment cells are in majority in the endoderm of the free wall of the zooid. Apart from this localisation of the cell types the gasterozooid agrees in the whole of its structure with the Hydroid polyp, as is clearly shown by m the figures (Text-fig. B, PI. Ill, figs. 28 and 29). Whilst the large cnidocysts occur in fair numbers in the stolons, the small ones are concentrated in the walls of the zooids. In the gasterozooids (PI. Ill, fig. 29) the cnidocysts are Text-fig. B. The contracted accumulated densely in the ectoderm near to the mouth of the polyp and gasterozooid of Pliohothrm entirely disappear further clown on the polvp wall; in the dactvlozooids they symmetricus. ec = ectoderm, cn= endoderm, ?» = mouth, are more uniformly distributed in the ectoderm in the whole length of the s = stolones, trw = the epi- . . , , , , ... ,_ . , . thel of the ea t r °b zoolfli but become however less numerous near its basis. — io judge from = mouth of the gastero- Moseley's drawing (1881 PI. VIII, fig. 2) the gasterozooid should have a wide, pore. (G0/j). cruciform mouth in Pliobotlirus symmetricus. The mouth of the polyp is closed in all the specimens examined from the 'Ingolf' Expedition and is neither larger nor shaped differently from that of the Hydroids generally. The cruciform appearance noted by Moseley is clearly due to chance, for the protruding parts of the endoderm in the numerous sections examined vary greatly
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Keywords: 1900, 1910, 1914, americana, archive, arctic_ocean, biodiversity, blc, book, bookauthor, bookcentury, bookcollection, bookcontributor, bookdecade, bookpublisher, booksubject, bookyear, copenhagen_h_hagerup, danish_ingolf_expedition_1895_1896_, drawing, historical, history, illustration, image, ingolf_cruiser_, mblwhoi, mblwhoi_library, page, picture, print, reference, scientific_expeditions, vintage
