. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. I30 HYDROIDA II be more common in the Scottish waters than is generally supposed from the data obtained; he con- siders it likely that it may have been confused with young colonies of Sertularia argcntea. This sup- position will probably prove correct, as the species is fairly common along the west coast of Norway, and penetrates right down to Bohnslan. It is also not uncommon at the F~aroe Islands and Iceland; with regard to the latter locality, it is scarce on the south coast, and appare
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. I30 HYDROIDA II be more common in the Scottish waters than is generally supposed from the data obtained; he con- siders it likely that it may have been confused with young colonies of Sertularia argcntea. This sup- position will probably prove correct, as the species is fairly common along the west coast of Norway, and penetrates right down to Bohnslan. It is also not uncommon at the F~aroe Islands and Iceland; with regard to the latter locality, it is scarce on the south coast, and apparently not very frequent on the north. From East Greenland, it is known only by a single find far to the north, whereas it has been met with several times in West Greenland waters. (Fig. LXVIII).. Sertularia Fabricii Levin sen. 1893 Serhdaria Fabricii., Levinsen, Meduser, Ctenophorer og Hydroider, p. 48, pi. 6, figs. 14—17. Upright colonies with not very pronounced, monosiphonic stem, the hydrothecse and branches forming dextrorse spirals. Of tlie basal branches, only the basal internodium is retained, the remainder falling away. The stem is divided into internodia, each bear- ing a basal branch, alternating in each of the two Indro- theca series; l^etween two successive branches in the same hydrotheca series the stem has normally three hydrothecse the lowest in the branch corner. The broad plane of the branches is horizontally set. The branches are secondarily ramified dichotomically, and divided into internodia of vary- ing length. The hydrothecte are set in two rows, sub- alternately or alternately placed; they are deeply imbedded the free part of the adcauline wall is between one-third and one-sixth the length of the hydrotheca, or between one-half a b and one whole opening diameter. The distal part of the hv- Fig. LXIX. Sertularia Fabricii froui Godtliaab, drotlieca diverges oulv slightly from the axis of the branch a Hydrothecte from the distal part of a branch. b Hydroth
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