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Intertidal and shallow-water sediment samples from the tropical Pacific Ocean were studied and a quantitative analysis made of the foraminifera and other constituents. The results indicate that many species of the intertidal and shallow-water foraminifera have been transported great distances across the Pacific Ocean. Seven methods of dispersal are analyzed. The distribution pattern of Baculogypsina and Tinoporus seems to be best explained by the transportation of their zygotic stages by ocean currents. The fluctuation in populations of Baculogypsina and Tinoporus is similar to the fluctuations in populations of many other marine invertebrates.

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