Grab samples were taken at 180 stations in the neighborhood of Biscayne Bay, Florida. These were from level soft bottom, free from “grasses”, and in shallow water. All species of infauna taken are recorded, together with their relative frequency in relation to the particle
size of the sediment. The following communities are distinguished, and their significance discussed: Amphioplus-Ophionephthys, Laevicardium-Codakia, Mellita-Tellina, Encope, Amphioplus-Dosinia, Plagiobrissus-Clypeaster, Venus.
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