Potamididae海蜷螺科:Shell medium to large in size, elongate conical woth may whorls. Surface sculptured with many spiral and typically thick axial ribs. Mature specimens have flared outer lip, deep siphonal canal. Anterior margin of the outer lip oftern expands over siphonal canal. Operculum circular and multispiral. Head with large snout. Pallial siphonal eye oftern present.