Article: Microplankton from the Kellaways Rock and Oxford Clay of Yorkshire

Assemblages of microplankton from the Kellaways Rock and Oxford Clay of Yorkshire are described. They consist dominantly of hystrichospheres, including new species of Cymatiosphaera and of Canno-sphaeropsis. Dinoflagellates are also prominent, with Gonyaulax jurassica Deflandre most abundant: two new species of Gonyaulax are described. Organisms incertae sedis, probably microplankton, are present: three new genera, Stephanelytron, Antrosphaera, and Netrelytron, and a new species of Wanaea are described. The character and stratigraphic significance of the assemblages are discussed.