. 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. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. 538 DEPTHS OF THE OCEAN Such great temperature differences produce a corresponding dissimilarity in the fauna (see pp. 13 and 661). We have trawled in the cold Norwegian Sea deep basin and captured more or less familiar arctic forms, and then only a few hours steam farther south we have trawled again on the
. 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. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. 538 DEPTHS OF THE OCEAN Such great temperature differences produce a corresponding dissimilarity in the fauna (see pp. 13 and 661). We have trawled in the cold Norwegian Sea deep basin and captured more or less familiar arctic forms, and then only a few hours steam farther south we have trawled again on the southern slope of the Wyville Thomson Ridge, and taken forms, fishes as well as inverte- brates, which one would expect to find in quite southern areas. Among the deep-water forms of the Atlantic that are present in large quantities on the southern slopes of the ridges and plateaus we have first some species of sea-urchins belonging to the remarkable family of the Echinothuridae (see Fig. 2>77)-^ They differ from all other sea-urchins in the structure of their shells, for, instead of having continuous plates of lime, their plates are connected by non-calcareous attach- ments of skin, so that their shells are flexible and more or less like leather. One species of holothurian, Lcstmogone violacea, is very abundant. It belongs to the same division as the forms Elpidia and Kolga, which are so plentiful in the Norwegian Sea. The " Michael Sars " also found large numbers of the star- fish Zoroasterfic/gens (see Fig. 378). The following are a few other forms met with on the southern slopes of the ridges :— Regular sea-urchins: Echinus alexandri and E. affinis, Porocidaris purpuvata. Irre- gular sea-urchins: UrecJdmis naresianus, Pourtalesia wandeli, Echinosigra pldale, Hemiaster expergitiis. Starfishes : BatJiybiaster rolmstus (a species which outwardly resembles B. vcxUlifcr of the Norwegian Sea, though the structure of its skeleton is different),- Plutonaster bifrons
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
