. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 6o HYDROIDA II. Fig. XXVII. Localities of Polyplumaria frutescens in the Northern Atlantic. In the hatched parts the Uterature notes a scattered occurence without further data. of the hydrotheca. The .secondary hydrocladium proceeds from beside tlie basal hydrotheca of tlie primary hydrocladium, and is of the same appearance as this. The gonothecse are fastened to the stem or the branch apophyses by a very short stalk. They are oval, with a large, somewhat asymmetrical distal opening, and
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 6o HYDROIDA II. Fig. XXVII. Localities of Polyplumaria frutescens in the Northern Atlantic. In the hatched parts the Uterature notes a scattered occurence without further data. of the hydrotheca. The .secondary hydrocladium proceeds from beside tlie basal hydrotheca of tlie primary hydrocladium, and is of the same appearance as this. The gonothecse are fastened to the stem or the branch apophyses by a very short stalk. They are oval, with a large, somewhat asymmetrical distal opening, and with four sarcothecae at the base. Material: "Thor" 35"57' N., 5°35' W., depth 740 metres Iceland: Vestmano, — 510 — According to Ritchie (1911 p. 223) the number of unpaired small distal sarcotheca; on the internodinm .should vary from one to three. No such variation could be discerned in the colonies investigated by me. Polyplumaria flabcllata is a very rare visitor in the northern waters (fig. XXVIII) and occurs here only in the deeper water layers. The species has altogether its main distribution in the upper parts of the abyssal region. The Vestmanna Islands mark the most northerly point where it has been found up to now; in Greenland waters it would seem to be entirely lacking. Polyplumaria profunda (Nutting). 1900 Plumularia profunda. Nutting, Phnnularidae, p. 66, pi. 8, figs. 2—3. Upright, composite pinnate colonies with branched polysiphonic main stem. The primary tube which is seen in the outer parts of the colony is divided by transverse nodes into internodia, bearing. 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
