. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. HYDROIDA 53 Perigonimus refiens is a southern species which penetrates into our seas. It has been recorded from the Mediterranean and the west coast of France, and occurs frequently in the sea round Great Britain and Ireland. Already in the North Sea its occurrence is more straggling. In the Danish waters and along the coast of Bohuslan it is still rather frequent. On the coast of Norway it is not unfrequeutly met with in the Trondhjemfjord, where the fauna, on the whole, bears a southern char- acter. But only once it has be
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. HYDROIDA 53 Perigonimus refiens is a southern species which penetrates into our seas. It has been recorded from the Mediterranean and the west coast of France, and occurs frequently in the sea round Great Britain and Ireland. Already in the North Sea its occurrence is more straggling. In the Danish waters and along the coast of Bohuslan it is still rather frequent. On the coast of Norway it is not unfrequeutly met with in the Trondhjemfjord, where the fauna, on the whole, bears a southern char- acter. But only once it has been found farther to the north, at Lofoten. Saemundsson (I911) re- cords several questionable specimens from the west and the north of Iceland. But these localities have to be confirmed. As a new locality must now be added the Faroe Islands. The species belongs to the litoral 200 m. boom looom. , 2000m- Text-fig. P. The distribution of Perigonimus repens in the Northern Atlantic Co localities needing further confir- mation. â In the hatched region the litterature denotes a scattered although common occurence of the species). Perigonimus abyssi G. O. Sars. 1874 Perigonimus abyssi, G. O. Sars, Bidrag til Kundskaben om Norges Hydroider, p. 96, pi. 5, Fig. 27â30. 1911 â â sp., Kramp, Danmarks-Ekspeditionen til Gronlauds Nordostkyst, p. 363. From the reptant stolons proceed unbranched polyp stems, which attain a length of mm. The polyps are about mm. long, broadly fusiform, bearing 5â8, usually 7 tentacles in a whorl. Below the tentacles the polyp is surrounded by a rather vigorous, wide, jellied pseudohydrotheca, which is, however, often hardly visible on the polyp wholly extended. The polyp stems are irregularly and strongly wrinkled, and have a dark-coloured, vigorous perisarc. The gonophores are developed into free medusae, having, when deliberated, a vigorously developed umbrella and four tentacles. The gonophores are developed on the polyp stems, to which
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