Living radiolarians have been collected from the waters of the Catalina basin. Plankton tows have been taken during all seasons, sampling the entire water column to 1,000 meters with closing nets. The most significant findings which may be useful in paleoecology are: the enumeration of shallow-water (0 to about 200 meters) and deep-water (about 100 to 1,000 meters) species, and the finding of subspecific variations in differing water masses which shift with a mixing or shifting of the water masses in the study area. A good correlation between water-mass-indicator radiolarians, foraminiferans, and diatoms also was found.

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