. 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. PELAGIC PLANT LIFE 357 The plankton of the cold water on the Newfoundland Bank The Nc was very poor in species, Ceratijim arcticum and Peridinmm g^^k^^ parallelum being the commonest forms. There were, besides, (Stations 70 9, 3( loth July.) a few diatoms, such as Chcetoceras atlanticum, C. criophihim, 79,
. 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. PELAGIC PLANT LIFE 357 The plankton of the cold water on the Newfoundland Bank The Nc was very poor in species, Ceratijim arcticum and Peridinmm g^^k^^ parallelum being the commonest forms. There were, besides, (Stations 70 9, 3( loth July.) a few diatoms, such as Chcetoceras atlanticum, C. criophihim, 79, 30th June and Rhizosolenia seynispina, all well-known species in the Norwegian Sea. In the harbour of St. John's, on the other hand, we found the plankton quite abundant, consisting of northern forms, both neritic and oceanic : the species of Chce- toce7'as {decipiens, debile) predominated. to our ir northern section across the Atlantic contributed largely knowledge of the distribution of species, since it showed Atlantic section. (Stations 8i- 92, I2th-24th July.). Fig. 2^().—Chmtoceras perpusillum (^f^). US that a great many tropical forms are still to be found in lat. 45-50^ N. These particular waters had been very little studied previously, and it was extremely interesting to follow all this Atlantic flora on its passive journey northwards. On the whole, its character remains unchanged, though of course the number of species becomes considerably reduced. During the first half of the section, on the western side of the mid-Atlantic ridge, there were a few small degenerate neritic diatoms belonging to the species which occur in the Atlantic water-masses south of Iceland : namely Chcutoceras schiittii, C. laciniosimi, and others. It seems unquestionable that they are derived from the American coast, and follow the current as far as Iceland. At Station 85 I also came across a remarkable little ChcEtoceras, that Cleve found in 1897 ^^ ^^ Skagerrack and named ChcBtoceras perpus
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