. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. lOO HYDROIDA II Sertularella amphorifera Allman. 1877 Sertularella amplwrifera, Allman, Hydroida of the Gulf Stream, p. 22, pi. 15, figs. 8—10. 1912 Serhdarella amphorina, Bedot, Materiaux pour servir a des Hydroides, 4™' periode, p. 352. Upright slender colonies with monosiphouic hydrocaulus. Stem and main branches slightly prominent. The basal part of the stem is straight, irregularly segmented, without hydrothecse and branches; higher up, it becomes regularly segmented, like
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. lOO HYDROIDA II Sertularella amphorifera Allman. 1877 Sertularella amplwrifera, Allman, Hydroida of the Gulf Stream, p. 22, pi. 15, figs. 8—10. 1912 Serhdarella amphorina, Bedot, Materiaux pour servir a des Hydroides, 4™' periode, p. 352. Upright slender colonies with monosiphouic hydrocaulus. Stem and main branches slightly prominent. The basal part of the stem is straight, irregularly segmented, without hydrothecse and branches; higher up, it becomes regularly segmented, like the branches, with a hydrotheca on the distal part of each internodium. The branches arise in irregular alternation, and may themselves again ramify; like the hydrotheca-bearing part of the main stem, they are bent zigzag fashion. The hydrothecse are large, cyhndrical, slightly curved, with three equal sized, markedly prominent teeth,* and in the sinuses between them three large triangular lid plates. The hydrotheca is attached to the branch by a narrow base. The polyp has a distinctly prominent abcauline blind sack. The gonothecge proceed from below the base of the hydrothecse. They are a slender oval to pear-shaped, with a distally central narrow neck, and distinct transverse furrows; the neck passes evenly over into the 11. Sertularella amphorifera from "Ingolf" St. 54. Part of a branch (X 20). leca of the stem with the basis of a branch (X 40). Material: "Ingolf St. 7, 63°i3' N-, i5°4i' W.; depth 600 fathoms, 4,5° - - 54, 63°o8' N., 15=40' W.; - 691 - 3,9° Nutting (1904 p. 88) who had only some fragments of Allmau's type specimen to work on, states that Sertularella amphorifera has possibly four hydrothecal teeth, and he gives some drawings where four such teeth are markedly in evidence, as if his specimen had been intact, and not, as he himself expressly notes in the text, defective. Billard (1906 p. 183) on the other hand, reports the s
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