. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 24 STYLASTERIDAE must be regarded as characteristic forms of the large biocoenosis of the coral reefs. This is also strengthened by the single discover}' of Stylastcr gcmniascrns made in the Hjelte Fjord in the ighbourhood of Bergen, where Dr. O. Nordgaard has obtained two small fragments of colonies ne from the coral reef there. We thus see that the two Stylastcr species which occur on the coast of Norway, form interesting parallels in the animal community of the northern coral reefs to t
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 24 STYLASTERIDAE must be regarded as characteristic forms of the large biocoenosis of the coral reefs. This is also strengthened by the single discover}' of Stylastcr gcmniascrns made in the Hjelte Fjord in the ighbourhood of Bergen, where Dr. O. Nordgaard has obtained two small fragments of colonies ne from the coral reef there. We thus see that the two Stylastcr species which occur on the coast of Norway, form interesting parallels in the animal community of the northern coral reefs to the Stylasterids of the tropical coral reefs. They are , like the Lophohclia reefs as a whole, bound in their occurrence to those localities witii hard bottom, where the Atlantic current makes its influence most felt in the Norwegian A Pliohothnts syntmetrit'iis A — — iiicompl. geograph. data. 9 Stylastcr gemmasceiis O — rosau + — (Allopora) norvegicus Text-fig. I''. Map showing tlie localities of the Styhntevidac in the North Atlantic and the Norwegian Sea. 200 ni. depth 600 - — 1300 - — The study of the occurrence of the North Atlantic Stylasterids shows several biogeographical features of interest (cf. Chart Text-fig. F). — Pliobothrus symmetricus was first described from the waters round about F'lorida and must be fairly connnon there between 190 and 300 metres. It has been found by the »Ingolf« on the steep slope off the south coast of Iceland towards the depths of the Atlantic in 594 and 658 metres. According to Duncan (1874 p. 336) the ;>Porcupines obtained a single specimen in the cold area of the Faeroe Channel; unfortunately he does not state the exact locality. We thus have a species here which Ijelongs to the warm Atlantic waters and uormalh- is not able to penetrate in over the submarine ridge, which towards the south separates the Norwegian Sea from the depths of the Atlantic. The (juc- find in the cold area must be a pure chance and f
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
