OCCURRENCE AND DISTRIBUTION OF THE MARINE PROTOZOAN SPECIES IN THE WOODS HOLE AREA

Foraminifera; or the papers of Schaefer (1923, 1924, 1926) on the marine amoebas. The marine Mastigophora have receivedscant atten tion as a whole although Lohmann (1902) and Schiller (1926) have published important papers. The Dinoflagellata, however, have been extensively investigated, notably by such workers as Kofoid and Swezy (1921), and Lebour (1925). There is even less general work on the marine Ciliata, although the Tintinnoidea have been extensively studied by some workers, notably Jorgensen (1927), and there are descriptive papers by FaurA©-FrA©miet(1924) and Kahl (1928). The “? Nordische Plankton― presents a survey of the marine Protozoa, and the chapter on pelagic plant life by Gran (1912) in “? The Depths of the Ocean― gives a generalization of what is knOwn with regard to the pigment bearing forms. How little we actually know of the occurrence and functions of the Protozoa in the seas is indicated by the fact that in the book “? The Marine Plankton,― (Johnstone, Scott and Chadwick, 1924) the Protozoa are not considered except for the “? vegetableplankton,― i.e., peridinians, whereas it has been definitely shown that a considerable part of the plankton both by numbers and volume may consist of Pro tozoa. They are probably more numerous and more important than is gen erally realized. Gran (1912) recorded more than “? 200,000 calcareous flagellates per liter . . . just outside the European coast bank― and Allen (1919) reported 14,450 per liter of sea water. He used the hand centrifuge to concentrate the organisms but was dissatisfied with the method, so by diluting his sea water into culture media and counting his