Summary A prolific assemblage of microplankton from the Shineton Shales (Tremadocian) is described. It consists almost entirely of hystrichospheres, including several new species of Hystrichosphaeridium, Micrhystridium, Veryhachium, Leiosphaeridia and Diornatosphaera gen. nov. The relationship of this assemblage to others of Lower Palaeozoic age is discussed.
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C. Downie (1958) studied this question.
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