One of three cyrena shells. The shell is brown on the outside and white on the underside.
The chief shell used in its natural form is the Cyrena, which serves at the present time as a knife, a scraper and a spoon. Even when they have knives of iron and steel they still use the Cyrena shell in preference for some purposes. It is used as a scraper in preparing fibres for rope and thread, in making arrows, as a knife for cutting thatching leaves and cane and even thread and rope, and for making incised patterns on bows and arrows. The shells are always to be found lying about their encampments, and a few are always carried with them when they migrate to a fresh camp. Those living inland obtain their supply from their friends on the coast. Brown 'The Andaman Islanders' 1922