Abstract
An assemblage of microplankton from the Cornbrash of Yorkshire is described. It consists dominantly of dinoflagellates, including three new species of Gonyaulax and one new species of Pareodinia. A relatively small number of hystrichospheres are present, including new species of Baltisphaeridium, Cymatiosphaera, and Pterospermopsis. The character and significance of the assemblage are discussed.

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