The Migration of Animals from the Ocean into Freshwater and Land Habitats

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Abstract
The relations of variations in salinity, temp., desiccation, conditions for respiration, and other factors to aboceanic movements are discussed. Migrations have apparently taken place along subterranean, fluviatile, lacustrine, marsh, swamp, and beach routes. Causes for migrations are concerned with reproduction, food, safety, aridity, and O.