. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 112 HYDROIDA II Diphasia rosacea (Linne) L. Agassiz. 175S Srrtularia rosacea, Linne, Systema naturae, Ed. 10, p. 807. 1862 Diphasia rosacea, L. Agassiz, Contributions to the natural history of the United States, vol. 4, p. 355. Upright colonies without distinct main stem. The colonies are irregularly pinnate or bushily nched, segmented, and with a pair of oppositely placed hydrothecse on each internodium. The hvdrothecse are slender, almost evenly tubular, with slightly divergent distal part. The free distal portion of the a
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 112 HYDROIDA II Diphasia rosacea (Linne) L. Agassiz. 175S Srrtularia rosacea, Linne, Systema naturae, Ed. 10, p. 807. 1862 Diphasia rosacea, L. Agassiz, Contributions to the natural history of the United States, vol. 4, p. 355. Upright colonies without distinct main stem. The colonies are irregularly pinnate or bushily nched, segmented, and with a pair of oppositely placed hydrothecse on each internodium. The hvdrothecse are slender, almost evenly tubular, with slightly divergent distal part. The free distal portion of the adcauline wall is about half the length of the hydrotheca, between i1 /, times and twice the opening diameter, rarely somewhat shorter, down to about the same length as the opening dia-. 200 ffi. 600 m. tooo m. :ooor. Fig. LX. The occurrence of Diphasia rosacea in the Northern Atlantic. In the hatched region a common occurrence is recorded. meter. The opening margin has a slight adcauline sinus, in which the large opercular plate is attached. The gonothecse arise close under the base of the hydrothecae. The males are pear-shaped, with normally eight longitudinal ribs, each terminating in a distal short blunt point; the gouotheca has a central short cylindrical neck. The females are also pear-shaped, with eight long ribs, of which six terminate in as many broad blades closing together over a distal brood-chamber; the two last, diametrically opposite ribs end in forward pointing horn-like outgrowths of varying length. Material: "Thor" 63°3o' N., 20° 14' W., depth 80 metres. Iceland: Stykkisholm, — 30 fathoms. Ssemundsson (1902 p. 66) also mentions specimens of this species from 0nundarfjord, Ice- land, but a reinvestigation of his specimens shows that they must be referred to Diphasia 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 ma
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