Natural History Notes: Is a synonym to C. variable (Adams, 1845). Characteristics: The species varies considerably in shape, color and sculpture. The shell reaches 13 mm, and is usually dark brown to purple-brown. Some shells are mottled with brown and white. The part of the aperture which is visible is white, but the aperture darkens internally. The thin operculum is brown and paucispiral. The varices are paler. The protoconch is narrow and white, but often missing from adult shells. The apex is usally white. Shells generally have spiral rows of rounded beads, with several spiral threads between. Inside the outer lip, spiral ridges are sometimes paired. The animal is gray to black with a yellowish tint, and the underside of the foot is creamy white.