. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 13° 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 argentea. This sup- position will probably prove correct, as the species is fairly common along the west coast of Norway, and penetrates right down to Bohuslan. It is also not uncommon at the Faroe Islands and Iceland; with regard to the latter locality, it is scarce on the south coast, and apparently not very frequent on the north.
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 13° 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 argentea. This sup- position will probably prove correct, as the species is fairly common along the west coast of Norway, and penetrates right down to Bohuslan. It is also not uncommon at the Faroe 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 Levinsen. 1893 Sertularia Fabricii, Levinsen, Meduser, Ctenophorer og Hydroider, p. 48, pi. 6, figs. 14—17. Upright colonies with not very pronounced, monosiphonic stem, the hydrothecae and branches forming dextrorse spirals. Of the 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 hydro- theca series; between two successive branches in the same hydrotheca series the stem has normally three hydrothecae 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 hydrothecse 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 and one whole opening diameter. The distal part of the hy- drotheca diverges only slightly from the axis of the branch On the spiral branches, the hydrothecse tend more or less towards unilateral arrangement on the upper side of the branch. The hydrothecae are of equa
Size: 1138px × 2196px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectscientificexpedition
