Archive image from page 113 of The Danish Ingolf-Expedition (1918). The Danish Ingolf-Expedition danishingolfexpe0507ingo Year: 1918 io6 HYDROIDA II Sertularella fusiformis assumes a highly characteristic appearance from the peculiarity that it has often on stem or branches two or three short branchlets proceeding simultaneously from the same point, these short branchlets consisting of a single interuodium, or more rarely a couple, with large hydrothecse almost terminally placed. An excellent picture of this is given by Jaderholm (1909 Taf. 11, fig. 9). His specimens undoubtedly belong to Se
Archive image from page 113 of The Danish Ingolf-Expedition (1918). The Danish Ingolf-Expedition danishingolfexpe0507ingo Year: 1918 io6 HYDROIDA II Sertularella fusiformis assumes a highly characteristic appearance from the peculiarity that it has often on stem or branches two or three short branchlets proceeding simultaneously from the same point, these short branchlets consisting of a single interuodium, or more rarely a couple, with large hydrothecse almost terminally placed. An excellent picture of this is given by Jaderholm (1909 Taf. 11, fig. 9). His specimens undoubtedly belong to Sertularella fusiformis, and are only remarkable in having the internodia entirely smooth; here, however, all transition stages occur, so that we are not warranted in setting aside the specimens on such ground as tvpes of a distinct species. Sertularella fusiformis is probably a warm atlantic species, but its occurrence is little known. In the waters investigated, it is previously known from the Hebrides, and from the Clyde Sea area; to these, Jaderholm adds a single find from Spitzbergeu, and the species has now also been taken by the 'Iugolf' about midway between the Faroe Islands and Iceland. Sertularella rugosa (Linne) Hincks. 1758 Sertularia rugosa, Linne. Systema naturae, Ed. 10, p. 809. 1868 Sertularella rugosa, Hincks, A History of the British Hydroid Zoophytes, p. 241, pi. 47, fig. 2. Upright, irregularly branched small colonies without pronounced main stem; the latter is mono- siphonic. The colony is divided by oblique nodes into short internodia, each bearing a hydrotheca directed alternately to either side, and situate 011 the upper half of the interuodium. The hydrothecse are broad oval or barrel-shaped, with deep transverse furrows, which are particularly marked on the abcauline side, where a very deep furrow is always found immediately beneath the aperture. The opening forms an angle with the hydrotheca axis, and is turned away from the branch; it is furnished with
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