. The Danish Ingolf-expedition. Marine animals; Marine animals; Hydrography; Hydrography; Scientific expeditions. 140 HYUROIDA II Iceland: Danmark Strait 66°2o' N., 25°i2' W., depth 96 fathoms Adalvik, depth 5,5 fathoms (on roots of Laminaria). The Faroe Islands: 6 miles N. by W. of Store Kalso, depth 60 fathoms Vestmanhavn (depth not stated) Deep hole of north point of Nolso, depth 100 fathoms 16 miles E. by S. of south point of Nolso, depth 80 fathoms Boronses 13 miles N. 75 W., depth 30 fathoms. Quite young colonies of Thujaria thuja are pinnate, and very difficult to distinguish from small
. The Danish Ingolf-expedition. Marine animals; Marine animals; Hydrography; Hydrography; Scientific expeditions. 140 HYUROIDA II Iceland: Danmark Strait 66°2o' N., 25°i2' W., depth 96 fathoms Adalvik, depth 5,5 fathoms (on roots of Laminaria). The Faroe Islands: 6 miles N. by W. of Store Kalso, depth 60 fathoms Vestmanhavn (depth not stated) Deep hole of north point of Nolso, depth 100 fathoms 16 miles E. by S. of south point of Nolso, depth 80 fathoms Boronses 13 miles N. 75 W., depth 30 fathoms. Quite young colonies of Thujaria thuja are pinnate, and very difficult to distinguish from small colonies of Thujaria laxa Allman. The broad plane of the branches in such specimens, up to a couple. _ _ ^ doom. 2 000 m. Fig. LXXV. The distribution of Thujaria thuja in the Northern Atlantic. In the hatched regions a common occurrence is recorded. of centimetres high, is vertical, and the branches are single. Here, however, the hydrotheca at the tip of the branch, which is of the Sertularia type, will as a rule reveal the identity of the species. The occurrence of this type of hydrotheca in Thujaria thuja is, as I have previously pointed out (1905) of considerable interest, as giving us a hint of the derivation of the Tkujaria species from Sertularia. Thujaria thuja is a boreal species, capable of moving far to the south; it is said to have been found both off the coast of Portugal and in the Mediterranean, but is not common south of Ireland. On the other hand, it does not enter the purely arctic waters; it has its chief distribution in the deep littoral region, but may occasionally be met with in the abyssal, and even deep down in the same, as is seen from the finds of the "Ingolf" at St. 95 and 96. In the North Atlantic (fig. LXXV) the. 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 may not perfectly resemble the original Danish
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