Habitat: Underside of rocks Depth: ~9m Characteristics: Shell reaches 5.25 mm in diameter, is cap-like and narrowly ovate. The exterior is white with a yellowish tint. There is a long slit at the base of the anterior slope. Growth lines shaped like small raised arches cross the anal fasciole, which narrows towards the curled-over apex. Rectangular pits are formed by the intersection between evenly spaced radial ribs and concentric ridges. Inside each pit is a secondary sculpture of four or five concentric striae interrupted by a single radial thread. Maximum reported size: 7 mm