The choice of N. gibbosulus in Mediterranean sites and N. kraussianus is South African web-sites is usually a functionality in their availability within the vicinity of the internet sites, but will not make clear why this genus was chosen about other shells of similar measurement and condition. A comparison with https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf