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The Plankton of the Faröe Channel and Shetlands. Preliminary Notes on some Radiolaria and Copepoda

Published online by Cambridge University Press:  11 May 2009

R. Norris Wolfenden
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Extract

In the year 1899 I commenced a series of tow-nettings round the coast of Shetland, and established four stations—one south of Sumburgh Head (III.), one west of Papa Stour (IV.), one of the northernmost points of Shetland (V.), and one due east of Bressay (VI.). During 1899 my yacht (the Walwin), a cutter of forty tons, made the round of these stations once a month during October, November, and December; and in 1900 during January, February, March, April, May, and June. During July, 1900, a passage was made across to Thorshaven (and back to Scalloway, Shetland), where stations were established, numbered respectively A1, A2, A3, A4, A5, A6, A7, A8, A9. (See Chart.) During August, 1900, only a short trip to the first two stations in the Faröe Channel was possible. In October, 1900, January, 1901, April, 1901, the stations round Shetland were visited again, and during May, 1901, a further passage was made to Thorshaven and back to Scalloway, visiting the stations previously fixed in the Faröe Channel. This passage was repeated in June, 1901, and again in July, 1901.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 6 , Issue 3 , January 1902 , pp. 344 - 372
Copyright
Copyright © Marine Biological Association of the United Kingdom 1902

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References

page 345 note * Mr. H. N. Dickson, of Oxford, has been kind enough to undertake the analysis of my water samples.

page 347 note * Haeckel (Challenger Report) describes C. pelagicum as having small, irregularly shaped central capsules, transparent and without oil globules, often many extracapsular vesicles in the jelly body. Membrane very thin and delicate. Diameter of central capsules, ·02-·08 mm.

page 348 note * Die Koloniebildenden Radiolarien.

page 348 note † This does not appear to be an accidental occurrence, but a constant association.

page 349 note * Challenger Report, “Radiolaria,” p. 26.

page 353 note * The dissection of this membrane from the central capsule is very easily accomplished without previous treatment of the specimen.

page 356 note * In my experience no method of preservation retains the form of the animal in such a normal condition as the well-known 5 per cent, formalin. Specimens may be observed in detail on shore when opportunities fail—as they usually do—at sea, within a few weeks with practical certainty that the organisms have retained their normal condition. Spirit or other preservative certainly distorts to a considerable extent.

page 359 note * In some hauls, e.g. Station A1, in August, 1900, they were captured in great quantity in the Mesoplankton, chiefly at 350 fathoms.

page 361 note * The Copepoda of the Faröe Channel will form the subject of a subsequent monograph.

page 362 note * Eucalanus crassus, Pleuromma robusta, Ægisthus, Augaptilus I found in Fowler's collection, the two first also occurring in my own tow-nettings.

page 366 note * The nearest related genus is Gaetanus (Giesbrecht), but this Copepod is removed from it by the absence of any median spine on the head. The indistinct traces of segmentation of the first and second feet cause it to approach the genus Gaetanus, while the lamellæ of the fourth feet (basal joint) again differentiate it. On the whole, it approaches more nearly to Gaidius than Gaetanus.