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from The Century Dictionary and Cyclopedia

  • A group of rostriferous gastropods, with the gills of few (12 to 15) laminæ in regular descending spiral rows on the left side of the mantle-cavity, the operculum distinct, and the aperture of the shell contracted moderately and roundish. It includes the families Planaxidæ, Rissoidæ, Melaniidæ, Cerithiidæ, Viriparidæ, and others.


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