. 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. INVERTEBRATE BOTTOM FAUNA 529 and a few other species of Tellina, Verms fiucttwsa, Cardium ciliatmn, C. grojilandicum, Thracia trwicata (rarely found in the boreal region), Pandora gladalzs. Brachiopods : Rhynchonella psittacea (see Fig. 371), TerebraUdina spitsbergensis. Echinoderms : Asterias lincki, A. p
. 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. INVERTEBRATE BOTTOM FAUNA 529 and a few other species of Tellina, Verms fiucttwsa, Cardium ciliatmn, C. grojilandicum, Thracia trwicata (rarely found in the boreal region), Pandora gladalzs. Brachiopods : Rhynchonella psittacea (see Fig. 371), TerebraUdina spitsbergensis. Echinoderms : Asterias lincki, A. panopla, A. gr'bnlandica, A. Jiyperborea, SticJiaster albulus, Ctenodiscus crispatus, Ophiopleura borealis, OpJiiura nodosa, Amphiura sundevalli, Ophiopus arcticus, Gorgonocephalus eucneniis and G. agassizi, Antedon eschrichti, A. prolixa, Cuciimaria niinuta, C. glacialis, Eiipyrgus scaber, Trodwstoma boreale, Ankyro- . —' -i>.^ derma jeffreysi, Chirodota Icevis, Myriotrochus rinki. Decapod crustaceans: Sclerocrangon ^ ferox, S. boreas, Sabinea septemcarinata, Hippo- ^^^^^^^ -^-^ V\ lyte turgida and H. spinus, BytJwcaris payeri, Idotea entonion. Two species of pycnogonids, Nynip]ion robustuni and N. Jm'tipes, are very ^ig. 371. abundant in the arctic region ; the former is Rhynchonella psittacea, Chemn. largely a deep-sea form, which descends far (After G. o. Sars.) down into the cold area of the Norwegian Sea deep basin, whereas N. liirtipes belongs more to the banks and plateaus. Both species were trawled by the "Michael Sars" on the Jan Mayen plateau, showing that they may be abundant in shallow waters also. The largest pycnogonid of the Norwegian Sea is Colossendeis proboscidea, found both on the slopes of the deep basin and on the banks. There are also several other species of Nyniphon, such as N. elegans, N. macronyx, and N. gracilipes, which are common arctic forms. The hydroids have comparatively few purely arctic species, though the magnificent large Tubu
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
