Describes new Miocene and Quaternary species of the toothed endodont Ptychodon recovered from deep drill holes on Bikini, Eniwetok, and Funafuti atolls. In view of the wide distribution of related living forms on high forested islands of Polynesia and Australasia, the fossil land snails provide additional evidence supporting the theory that many western Pacific atolls were formerly high islands which served as stepping stones for dispersal of terrestrial faunas, and also indicate that the overall history of subsidence, in the areas drilled, was interrupted by periods of emergence.

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