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Abstract
Based on a comparison of type material Teramachia dalli claydoni Poppe, 1986 and T. dupreyae Emerson, 1985 are synonymized with T. dalli (Bartsch, 1942) and T. johnsoni (Bartsch, 1942) respectively. Additional data on the occurrence of both species on the continental slope off the North West Shelf of Western Australia, based on specimens in the Western Australian Museum, is provided. Data presented include information on the shells, radulae, operculae, and geographic and vertical distribution.