. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. j6o hydroida ii often curving slightly outward. The basal chamber is well developed, and bounded at the top by a more or less pronounced ring-shaped thickening of the wall, often with a fairly thick base. The gonotheccu are attached to the stolons by a short, generally rudimentary stalk. They are oblong oval to cylindrical; the wall is often furnished with oblique furrows forming a spiral, but may as often as not be quite smooth; all intermediate forms and types occur in one and the same colony. The gonophores are eumedusoid
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. j6o hydroida ii often curving slightly outward. The basal chamber is well developed, and bounded at the top by a more or less pronounced ring-shaped thickening of the wall, often with a fairly thick base. The gonotheccu are attached to the stolons by a short, generally rudimentary stalk. They are oblong oval to cylindrical; the wall is often furnished with oblique furrows forming a spiral, but may as often as not be quite smooth; all intermediate forms and types occur in one and the same colony. The gonophores are eumedusoid and sessile, or break loose during a part of the breeding season as defective medusae (Agasfra). Material: "Ingolf" St. 34, 65ci7' N., 54°i7' W.; depth 55 fathoms - 127, 66°33' N., 20°o5' W.; - 44 4,6° "Thor" 64°02r N., 22°33' W.; — 34 metres Greenland: Godhavn (depth not stated) Jakobshavn ( — - — ) Egedesminde ( — - — ) Store Hellefiskebanke, off Holstensborg (depth not stated) Davis Strait, depth 100 fathoms (without further details) Sukkertoppen on algae (depth not stated) Godthaab ( — - — ) Iceland: Bakkefjord, depth 10 fathoms Vopnafjord, on littoral algce Seydisfjord, depth 6 fathoms Vestmano, on littoral algae Reykjavik, depth 2—3 fathoms 10 miles W. of , depth 26 fathoms Keflavik, on littoral algae Bredebugt, 65°i7,5' N., 23°32' W., depth 7—12 fathoms 65°iS,5' N, 23°o2' W, 9-12 Stykkisholm — 30 The Faroe Islands: Svino, on lamiuarians, depth 60 fathoms. The synonymy of this species should be clear enough after the investigations which have been made by Levin sen (1S93) Kramp U911) and myself (1909); nevertheless we find, that Nutting (1915) again distributes the species among no fewer than four, and even places these in two different genera. With regard to the transition stages between Campamdana Integra and Orthopyxis caliculata, we find the following (1915 p. 34) "Broch . . says that the gouangia of the
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