The design, construction and use of an inexpensive manually-controlled plankton sampler is described. Fabricated in a plaster mold from polyester resin reinforced by glass fibers, the 15-in. long casing, together with its internal cone of bolting silk, weighs but 14 ounces. Towed at speeds up to 17 knots during a trans-Atlantic crossing aboard a commercial freighter, it successfully collected a variety of plankton organisms, including living globigerinids with extended pseudopodia and intact spines.

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