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From the numerous specimens collected at various localities along the coast of the Korean Peninsula and its adjacent islands, we obtained the following results about the distribution of Haliotis species in the Korean waters. 1) The following four forms of Haliotis are found in the Korean waters : Haliotis gigantea gigantea Gmelin, H. gigantea sieboldi Reeve, H. gigantea discus Reeve, and H. kamtschatkana Jonas. 2) H. kamtschatkana, a boreal species, is found along the coast of the Korean Peninsula and its adjacent islands, while the remaining three forms, belonging to the temperate species, are found on the coast of Saisyu-to (Quelpart Island) and Tusima. In some islands lying between the Peninsula and Saisyu-to, all of the above four forms are found together. 3) The boundary zone of distribution of the above two groups of Haliotis almost coincides with the 12℃.-isothermal line at 25 metre depth in winter.