. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA II 167 Lao)iicdca geniculata is a cosmopolite, belonging to the npper part of the littoral region; in northern seas it is chiefly restricted to the Laminaria^ bnt may also occnr on deeper-growing Zostera and on shallow red algte in large qnantities. Albeit properly cosmopolitan, the species is nevertheless very rare in strictly arctic waters, but may occur here right into the White vSea. It is most frequent in the boreal areas. Along the coasts of Norwa)-, round the British Isles,
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA II 167 Lao)iicdca geniculata is a cosmopolite, belonging to the npper part of the littoral region; in northern seas it is chiefly restricted to the Laminaria^ bnt may also occnr on deeper-growing Zostera and on shallow red algte in large qnantities. Albeit properly cosmopolitan, the species is nevertheless very rare in strictly arctic waters, but may occur here right into the White vSea. It is most frequent in the boreal areas. Along the coasts of Norwa)-, round the British Isles, the Faroe Islands and Ice- land it is present in great numbers (fig. L,XXXV). It is also mentioned from Greenland, but no de- finite locality has yet been 200 m. 600 m. .- looom. 2 000 m. Fig. LXXXV. The distribution of Laomedca geinciihta in tlie Northern .Atlantic. In the hatched regions the species is abundant. Laomedea longissima (Pallas) Alder. 1766 Sertularia longissima^ Pallas, Elenchus zoophytorum, p. 119. 1858 Laomedca — , Alder, A Catalogue of the Zoophytes of Nortliumberland, p. 121. 1868 Obelia — , Hincks, A History of the British Hydroid Zoophytes, p. 154, pi. 27. 1868 — flabrllata, Hincks, p. 157, pi. 29. Large graceful colonies with monosiphonic, brown stem, generally flexuous. I'rom this pro- ceed secondarily ramified branches, which again give off a hydrotheca stalk from the apophyse at each bend. There is no thickening of the periderm under tlie apophyses. The hydrothecai are about twice as long as broad, slender, inversely conical, with more strongly curved basal part. The hydro- theca margin is more or less curved, at times with distinct teeth, at others quite smooth. The basal chamber is fairly large, and bounded at the top by a finely built l)ut distinct Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrati
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
