At least two kinds of irritation arise from contact of man's skin with minute planktonic organisms in southern Atlantic waters off the U.S.A. One kind, called sea-bather's eruption, affects beach bathers and has been associated with marine schistosome cercariae by some workers. Another
is commonly experienced by swimmers in reef areas. Evidence which suggests that the latter kind of irritation is caused by the nematocysts of larvae, small adults or parts of the Coelenterata is presented.
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