. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic. Oceanography. 492 DEPTHS OF THE OCEAN CHAP. not on soft clay bottom ; all the individuals from stations in the open North Sea at considerable depths were very much lighter in colour and much larger than those taken along the Norwegian and British coasts. A good idea of the enormous quantities in which this form sometimes occurs was afforded by a haul with the dredge off Aberdeen, in 25 metres of water (tempera
. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic. Oceanography. 492 DEPTHS OF THE OCEAN CHAP. not on soft clay bottom ; all the individuals from stations in the open North Sea at considerable depths were very much lighter in colour and much larger than those taken along the Norwegian and British coasts. A good idea of the enormous quantities in which this form sometimes occurs was afforded by a haul with the dredge off Aberdeen, in 25 metres of water (temperature C), where they must have literally covered the bottom, and the same remark applies to the west coast of Jutland. In some localities we met with numbers of Brissopsis lyrifera, which prefers as a rule clay bottom in deep water at a tem-. Fig. 347. Ophiura ciliaris, L. Reduced. perature of 6° or 8° C, though occasionally specimens may be found on sand. Everywhere, throughout the whole area examined, there were the two brittle-stars Ophiopholis aculeata and Ophiothrix fragilis, as well as the starfish Ltridia sarsi, which are numerous here and there, but cannot be called characteristic forms. More local, though plentiful in places, were sea-slugs (Cucumaria elongatd), which were met with at two stations, together with Brissopsis, on muddy bottom in about 50 metres, at a temperature of approximately 8° 1 Of other echinoderms found at a few stations, in smaller quantities, I may mention Ophiura albida (only at one or two stations in the neighbourhood of the Danish coast and one station off Aberdeen in 25 metres) and O. sarsi, Amphiura filifonnis {chiajeil), Ophiocten sericeum (many young-stages in young-fish trawl east of Aberdeen in 62 metres, temperature 8*4° C, and also from the Norwegian depression), Astcrias miilhri, Solas/cr papposm (only from the edge of the. Please note that these images are extracted from scanned page images that may have been digitally
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
