. 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. «, shells of Neptttnea, and on several specimens of this large snail two other large actinians [Urticina crassicornis and Metridium dianthus) had attached themselves. Our common whelk {Buccinupt undatitm, see Fig. 348) occurred over the whole area down to a depth of 100 metres, as a rule along with the two snails referred to, though never in such great Nudibranchs yielded, with one or
. 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. «, shells of Neptttnea, and on several specimens of this large snail two other large actinians [Urticina crassicornis and Metridium dianthus) had attached themselves. Our common whelk {Buccinupt undatitm, see Fig. 348) occurred over the whole area down to a depth of 100 metres, as a rule along with the two snails referred to, though never in such great Nudibranchs yielded, with one or two exceptions, only a very few specimens, and this was particularly the case with Tritonia, Doris, and Doto. At certain stations, however, re- markably enough from muddy bottom where there were no hydroids, the young-fish trawl brought up quantities of y^olis, which had most probably located themselves upon Virgularia and Alcy- onium, although their usual home is among hydroids. Chceto- derma, a worm-like ^g#§ form belonging to the ^*^ molluscs, was repre- sented by only a few specimens (depth 47 to 80 metres, tempera- ture 7° to 8° C); cuttle-fishes by some specimens of Loligo forbesi at one station (depth 38 metres, temperature io° C), and a little Sepiola from 94 metres. The almost complete absence of species of Chiton, 1 Of more or less regularly distributed mollusc-forms we may further mention : Pecten opercularis (large), Mytilus modiolus (from a depth of 96 metres about 70 specimens were taken, averaging 11 or 12 cm. in length and often with Urticina attached), Modiolaria nigra, Cardium echinatwn, Cyprina islandica, Venus gallina, Mactra elliptica (very numerous off the coast of Jutland, 14 metres, temperature C), Solen ensis, Cultellus pellucidus, Aporrhais pes-pelecani, Antalis entalis. At some stations we came across Nucida tenuis, Leda minuta, Kellia suborbicularis, Corbida gibba, Dosinia lincta, Cylichna cylindracea, all on mud in about 50 metres and at
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
