. Die dänische Ingolf-Expedition. Wissenschaftliche Expeditionen; Arktischen Ozean. HVIIROIDA II 181 in Folge traf in der Davis Strait, die damit bewiesen ist, jedenfalls zum Teil in der Boundary Waters der borealen Zone. Doch die Arten dringen nur ganz ausnahmsweise in die West Green-land Fjord, die als rein Arktis angesehen werden, was zum Teil auf die Vermischung der Schmelzwasser von den Gletschern und teilweise auf den Norden - Zweig der Ostgrönland Polar Aktuelle, die Cape Farewell rund und läuft in einiger Entfernung von der Küste Hier finden wir noch Dynamena p

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. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. HVIIROIDA II 181 quently met with in Davis Strait, which is thus proved to belong, at any rate in part, to the boundary waters of the boreal region. Yet the species penetrate only quite exceptionally into the west Green- land fjord area, which must be regarded as purely arctic, partly on account of the intermixture of melting water from the glaciers, and partly owing to the north-going branch of the East Greenland Polar Current, which turns round Cape Farewell and runs some distance up the coast Here we still find Dynamena pumila sporadically, probably because the investigations were carried out at a time when the summer heat had brought the surface temperature up a little, enabling the species just to exist for a brief while, and under difficulties. Not until we reach the waters between Holstensborg. Fig. XCI. penetrate 2 00 m. boom. ._ looom. 2 000 m. The occurrence of Halecium muricatum, and Serltdarella tricuspidata, two arctic species which into the southern parts of the boreal region. (The red line approximately indicates the limit of the cold area). and Egedesminde do the boreal elements in the coast fauna become more pronounced. In Danmark Strait, between Greenland and Iceland, we see that the finds group themselves closer as soon as we pass south of the o° isotherm, where the depth conditions are more favourable. Despite their positive bottom temperature, the shallower North-Icelandic waters seem to take a more arctic character, though this may, as we shall presently see. perhaps be equally well explained as due to insufficient investi- gation. Between Iceland and the Faroe Islands, the species move up to the verge of the cold area, but do not pass it. And the whole of that part of the Norwegian coastal banks which falls within the limits of the chart presents an entirely boreal character. Turning now to the other side, and taking the distribution of the arctic-boreal species Hale- cium

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