Bittiolum variumBittiolum varium, common name the grass cerith, is a species of sea snail, a marine gastropod mollusk in the family Cerithiidae.DistributionBittiolum varium occurs in shallow waters of the Western Atlantic between the East [Coast of the United States] and Brazil.DescriptionThe maximum recorded shell length is 6.5 mm.HabitatThe minimum recorded depth for this species is 0 m; maximum recorded depth is 11 m.