. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. IIYDROIDA IJ 131 Jan Mayen, depth 50—60 fathoms (East-Grceiilaiul Expedition). Iceland: Mouth of Berufjord, depth 41—54 fathoms. Kara Sea, "Dijmphna". Srrhihind I'tibricii is very closely related to Srrtulariu cuprrssina^ but differs ])rimaril\- in its dextrorse stem. Moreover, its hydrothecce are as a rule more deei)ly imbedded than in the latter species (fig. LXIX). Levinsen (1893 p. 48) calls attention to a peculiarity in the species, to wit, that the basal branches throw off
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. IIYDROIDA IJ 131 Jan Mayen, depth 50—60 fathoms (East-Grceiilaiul Expedition). Iceland: Mouth of Berufjord, depth 41—54 fathoms. Kara Sea, "Dijmphna". Srrhihind I'tibricii is very closely related to Srrtulariu cuprrssina^ but differs ])rimaril\- in its dextrorse stem. Moreover, its hydrothecce are as a rule more deei)ly imbedded than in the latter species (fig. LXIX). Levinsen (1893 p. 48) calls attention to a peculiarity in the species, to wit, that the basal branches throw off their extreme parts, leaving only the proximal intcrnodium; this appears to be a characteristic feature in the species, the explanation of which cannot be arrived at from our present knowledge of its biolog)-; it gives the species a highly remarkable appearance. Another char-. f ogo m. 200 m. 600 m. .—._, Fig. LXX. Finds of Sritnlaria Fahricii ill the Northern .\ acter which has been emphasised is less reliable; according to lyevinsen, the upright direction of the branches is 45° with the longitudinal axis of the stem; but the colonies from Jan Mayen and from the •'Ingolf St. 2 had branches standing out almost perpendicularly from the stem, and farther out even turning downwards; in these colonies also, the tendency to unilateral arrangement of tlie liydrothecEe is remarkably slight; despite this, and despite the fact that they arc of finer build tiian those from Greenland, they cannot be regarded as types of a distinct .species. It is interesting to note how exactly the h}-drothecas in Scrtnlaria Fahricii follow the same rules in tlieir variation as in Srrtularia ciiprcssina. On the proximal part of the branches, the hydro- thecae are far more deeply imbedded than at the extremities (fig. LXIX). The gonothecte, on the other hand, evince a much slighter variational tendency in the present .specimens, which rather give i7«. Please note that these images are ex
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
