Archive image from page 622 of The depths of the ocean. 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 depthsofoceangen00murr Year: 1912 PELAGIC ANIMAL LIFE 587 fjords along with numerous species of Pandalus, 'the deep-water prawns,' which are now the object of import- ant fisheries. Hymenodora is known / / Vk even from the ice-region, and was met with by Scoresby during his arctic voyages. Though the Mollusca are widely distributed and represented by a vas
Archive image from page 622 of The depths of the ocean. 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 depthsofoceangen00murr Year: 1912 PELAGIC ANIMAL LIFE 587 fjords along with numerous species of Pandalus, 'the deep-water prawns,' which are now the object of import- ant fisheries. Hymenodora is known / / Vk even from the ice-region, and was met with by Scoresby during his arctic voyages. Though the Mollusca are widely distributed and represented by a vast number of different forms on the ocean-floor, the pelagic forms are comparatively few, but as re- gards abundance of individuals few groups of pelagic animals can com- pare with the winged snails or Pteropoda, which are divided into two groups: Thecosomata (or shelled pteropods) and Gymnosomata (or Pteropoda. naked pteropods). The Thecosomata are important on account of the part they play both in the plankton and in the bottom-deposits (see Chapter IV.). They include the family Limacinidae having a spiral shell, of which the well-known Liinadna Jielicina occurs in immense quantities in the Arctic (the seas around Spitsbergen and Greenland), while Liniacina balea, the ' Flueaat ' of Norwegian fishermen, is a boreal species, and Liniacina retroversa (Fig. 429) is a more southern form occurring also in the Norwegian Sea. The shell is about the size of a pin's head, and can
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Keywords: 1900, 1910, 1912, _michael_sars_north_atlantic_deep_sea_expedition_191, appell_f_jakob_johan_adolf_1857_, archive, book, bookauthor, bookcentury, bookdecade, bookpublisher, booksubject, bookyear, drawing, gran_h_h_haakon_hasberg_1870_, helland_hansen_bj_rn_1877_, historical, history, illustration, image, london_macmillan, murray_john_sir_1841_1914, north_atlantic_ocean, oceanography, page, picture, print, reference, vintage
