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When the prospectus for Leg 55 was presented, it outlined two separate objectives: first, to drill into seamounts of the Emperor chain in the northwestern Pacific, and second, to recover sediments of the Mesozoic Pacific crust on the oceanic side of the Kurile Trench, east of Hokkaido, Japan. Accordingly, the purposes of my participation in the cruise were (1) to relate previous radiolarian zonation of highand middle-latitude regions to that of the tropical Pacific; (2) to seek Mesozoic biostratigraphic succession in this far western corner of North Pacific; and (3) if possible, to relate this succession to that of land sections of Hokkaido. However, as the D/V Glomar Challenger finally sailed from Honolulu, Hawaii on 22 August 1977, after several postponements that delayed departure by more than one month, the shipboard scientists were belatedly informed that the drilling for Mesozoic crust was cancelled. Consequently, the scope of this report is necessarily more limited than had been anticipated. Methods of laboratory treatment of the cored sediments, and of recording the illustrated specimens in the strewn slides with an application of England Finder, are essentially the same as those of the previous reports (Ling, 1973, 1975, 1979). Relative abundance (A, abundant; C, common; F, frequent, R, rare) and state of preservation (G, good; F, fair; P, poor) are repeated according to the shipboard paleontological format. All the slides examined during the study discussed herein will be deposited permanently in the micropaleontological collection, Department of Oceanography, University of Washington, Seattle, Washington.

Radiolarians from the Emperor Seamounts of the Northwest Pacific: Leg 55 of the Deep Sea Drilling Project