. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 144 HYDROIDA II The gonothecse are set on the upper side of the branches. They are pear-shaped, with rudi- mentary neck and broad aperture. Material: "Ingolf" St. 31 66°35' N., 55°54' W., depth 88 fathoms 1,6^ - - 34 65^17' N., 54° 17' W., - 55 - - Greenland: Davis Strait, — 100 — (without further details) [type specimen]. Iceland: Skagi, — 20 — [labelled Thiijaria lonchitis\ Dyrafjord, — 15 — In all probability, this species also will prove to have a pinnate development stage, l
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 144 HYDROIDA II The gonothecse are set on the upper side of the branches. They are pear-shaped, with rudi- mentary neck and broad aperture. Material: "Ingolf" St. 31 66°35' N., 55°54' W., depth 88 fathoms 1,6^ - - 34 65^17' N., 54° 17' W., - 55 - - Greenland: Davis Strait, — 100 — (without further details) [type specimen]. Iceland: Skagi, — 20 — [labelled Thiijaria lonchitis\ Dyrafjord, — 15 — In all probability, this species also will prove to have a pinnate development stage, like the other, spiral Tliiijaria species. In the arrangement of the hydrothecte, Thujaria alteriiitJieca forms a parallel to Abicfinaria ^] fusca (Johnston), and it is interesting here to note how the hydrothecK, owing to their extremely close accumulation, thrust their opening part to one side or the other from the base of the next following. An investigation of the tip of the branch shows that this is a secon- dary phenomenon. The hydrothecte are to begin with s\inmetrically situate, with their symmetrical plane parallel to the branch axis; only on the formation of a new distal hydrotheca is the aperture of the one behind it thrust out to the side. We have here, then, a typical instance of convergenc}-, as towards ^i5/V'//w«r/« (?)/}«<:«, which cannot be taken as evidence of closer relationship, and thus does not afford any justification for uniting the two species mentioned, and other multiserial forms in a special genus Selaginopsis\ any such would also Iiave to include species with and those without blind sack, which can hardly be considered 600 m. .. .._/ooom. Fig. LXXVIII. Finds o£ 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 Ingo
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
