. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA 47 The reptaut stolons are covered 1)\- a continuous cliitinous coenosarc, whose surface is studded with small prickles, among which occur larger chitinous spines about mm. high, provided with lon- gitudinal rows of more or less regular small teeth. The large spines now and then show a tendency to divide at the apex. The polyps are up to 4 mm. long, or faintly reddish, with 20—30 tentacles in a dense whorl below the oral portion. The tentacles form a belt which appear
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. HYDROIDA 47 The reptaut stolons are covered 1)\- a continuous cliitinous coenosarc, whose surface is studded with small prickles, among which occur larger chitinous spines about mm. high, provided with lon- gitudinal rows of more or less regular small teeth. The large spines now and then show a tendency to divide at the apex. The polyps are up to 4 mm. long, or faintly reddish, with 20—30 tentacles in a dense whorl below the oral portion. The tentacles form a belt which appears double because of alternating displacement. vSpiralzooids without tentacles occur along the margin of the colony. The gonopliores are cryptomcdusoid, placed, to a number of 3 or 6, round reduced poly])s with rudimentar\- tentacles. Material: Greenland: Upernivik, depth 80—90 fathoms without particular data, from a cod's stomach. Skagerrak: the channel near Viuga (I5ohuslan), depth 50 fath. Hydractiiiia cchiiiata in its large chitinous skeleton-spines (Tab. I Fig. 9 and 10) has a very typical armour impeding a confusion with other northern species. It is an Atlantic-boreal species, showing a great power of enduring both high and low temperatures. It occurs very frequently in the North Sea, along the coasts of Crreat Britain and Ireland, goes to the south as far as into the Mediterranean, and is also found on the east coast of North America. The species belongs to the litoral region and almost always goes together with Eitpagiirus Beriihardus^ on whose house it settles. When we consider the distribution of the species along both sides of the northern Atlantic, we must wonder that it has not yet been observed at the Faroe Islands, and that only a single specimen has been met. Text-fig. N. The occurrence of Hydractwia echinata in the Northern Atlantic. (The hatched parties denote according to Htterature a scattered allthongh common occurence).. Please note that these images a
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
