. La profondità del mare : un conto generale della scienza moderna di oceanografia in gran parte basato su ricerche scientifiche del norvegese vaporizzatore Michael Sars nel Nord Atlantico. "Michael Sars" North Atlantic Deep-sea Expedition (1910); oceanografia; Nord Oceano Atlantico. Phronima. Â 4^3- (da Steuer.) grandi profondità, ed erano di conseguenza dovrebbe essere basso-abitatori. Successivamente il Principe di Monaco, e più tardi il " Valdivia," ha preso nel traino pelagiche-nets un numero di moduli appartenenti principalmente alla famiglia Sergestidae e ai generi AcanthepJiyra, Notostomus

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. 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. Phronima. â 4^3- (From Steuer.) great depths, and they were consequently supposed to be bottom-dwellers. Subsequently the Prince of Monaco, and later the " Valdivia, " took in pelagic tow-nets a number of forms belonging chiefly to the family Sergestidae, and to the genera AcanthepJiyra, Notostomus, and Eryoneicus, all of which were thus proved to lead a pelagic life. The " Valdivia " took Sergestes in a haul with a closing net from 5000 to 4000 metres, and Chun states in his narra- tive of the cruise that whenever the vertical nets reached deep water this genus never failed to appear in the hauls. During the Atlantic cruise of the " Michael Sars" we obtained large red prawns in such abund- ance (several litres per haul) as to prove that these animals play a more important part in pelagic life than was previously supposed. Our catches are also of special interest, be- cause their study has thrown new light upon the vertical distribution of the different species. We may here mention some of the most important forms recorded by Oscar Sund, who is describing this group. Of pelagic decapoda more than forty species were taken during our expedition, but the great bulk is made up of about a dozen species, each of which has a wide geographical range, being regularly caught at all stations over vast areas. Most of these common species, which will be dealt with later on, present peculiarities in their biology and distribution. Most of the pelagic decapoda be- long to the more primitive divisions of the group, viz. Sergestidae, Peneidae, Pasiphaeidae, and Hoplophoridae, but a truly pelagic Pandalid {Plesionika nana, n. sp.) was taken at most of the stations fro

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• bookcentury1900
• bookdecade1910
• bookpublisherlondo
• bookyear1912