. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. no HYDROIDA II The "Ingolf brought back from several of its stations colonies of the same type described by Ssemnndsson as Diphasia IVandeli. They are stiffly built, with a distinctly marked, often some- what darker and plainly segmented main stem. Each internodium has a pair of liydrothecae and a branch, directed alternately to either side, so that in these colonies, we have constantl\- two hydrothecct between two successive branches on the same side of the stem; of these two h^^drot
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. no HYDROIDA II The "Ingolf brought back from several of its stations colonies of the same type described by Ssemnndsson as Diphasia IVandeli. They are stiffly built, with a distinctly marked, often some- what darker and plainly segmented main stem. Each internodium has a pair of liydrothecae and a branch, directed alternately to either side, so that in these colonies, we have constantl\- two hydrothecct between two successive branches on the same side of the stem; of these two h^^drothecse, the one (the lower) is situate in the corner b\- the branch. In the most extreme specimens of this variant group, we find single undivided This variety- is represented b\- a particularh- pure type in specim- ens from the "Ingolf" St. 3 and St. 93. In these colonies, tliere is no pronounced fore or rear side as generally seen in Diphasia fallax. This must doubtless be taken in connection with the fact that the. ._ tO':iQ rn. Fij-droids; they thus stand more perpendicularly, and consequently developc more symmetrically, whereas the ordinary colonies, being fixed in a more horizontal position, find it better to develope more onesidedly, with an upturned "front". .Among the numerous transition forms, it will here suffice to mention some specimens from "Thor" (65^52' N., 23°58' W.). They are very closely allied to the group of variants described as a distinct variety, but exhibit at the .same time several of the characteristic features of the main species. The stem is not quite so marked as compared with the l)ranches, albeit its darker brown colour helps to brmg it out; its segmentation is prominent, and the branches proceed more openly and some- what irregularly, with three, or more often four hydrothecce between two branches on the same side. Please note that these images are extracted from scanned page images that may have b
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
