An ecologic study is being conducted on the living planktonic foraminifera and radiolaria off the southern California coast. Collections are being made with Clarke-Bumpus opening and closing, Nansen closing and vertical plankton nets. Initial findings indicate both general and zonal distributions. Globigerina bulloides d'Orbigny and Globigerina quinqueloba Natland show a general distribution throughout the water column (tows are taken from the surface to a depth of 1,000 meters), whereas Globigerina pachyderma (Ehrenberg) and Globorotalia scitula (Brady) occur only deeper than 100 and 500 meters, respectively, Morphologic similarities between foraminifera and radiolaria, as illustrated by deep living Globorotalia scitula (Brady) and Phacodiscus cf. clypeus Haeckel, are re ated to their bathymetric distribution. Studies on seasonal variation are as yet incomplete.

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