These green limpet shells are sold by the pound. Green limpets, also referred to as half-white limpets, are found on rocks in inter-tidal waters in areas of West Mexico to Ecuador. These Pretty green limpet shells are teal green in color and have a polished interior. As these are a natural product you will find some of the shells a bit paler or white. Shell Size: 1/2" to 1 1/4" long. Approximately 500 shells per pound. Genus and species: Sutorria mesoleuca. Wild. Mexico.