. 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 501 several stations, for instance on the northern slope of the Dogger Bank (38 metres) and north-west of the Great Fisher Bank {']'] metres). The Httle tube - worm Filigrana implexa, whose slender white irregular tubes are associated in trellis - work colonies, was met with over a
. 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 501 several stations, for instance on the northern slope of the Dogger Bank (38 metres) and north-west of the Great Fisher Bank {']'] metres). The Httle tube - worm Filigrana implexa, whose slender white irregular tubes are associated in trellis - work colonies, was met with over a large portion of the area examined, but only in the deeper parts. Another common form is Tkeieptts circi7tnaius, whose sinuous, parchment-like tube, covered with fragments of shells, grains of sand, etc., is attached to foreign substances such as empty mussel - shells, Flustra, etc. The annelid Aphrodite acu- leata is characteristic of the North Sea, but is as a rule limited to the deeper parts with soft or "mixed" bot- tom, though nowhere found in any great quantity. I have already stated that Sabella pavonia is common,^ and, speaking generally, we may say that as far as worms are concerned the central portion of the North Sea does not differ typically from the boreal portion of the Nor- wegian Sea. One peculiarity of the deeper parts of the central North Sea is that on soft bottom there is an absence of the foraminifera so plenti- ful in the Norwegian fjords very minutely the contents of the fine sieves through bottom-material was passed. It has been mentioned that in the southernmost portion of the North Sea, off the coasts of Belgium, Holland, and south- eastern England, there are many forms of southern origin, which are absent in more northerly latitudes; some of them, however, find their way farther north than the others, though all keep to shallow waters with high temperatures. ^' ' '. Fig. 353- Cory5tescassivelanus,Wo\\l. ,5 Reduced. (After Bell.) this I can
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