These are very iconic shells that belong to what is known as the helmet family. The appearance of the Scotch Bonnet is distinctly egg-shaped with a sharp spire located at the tip, while also possessing an outer lip that has a series of sharp teeth. These shells held a variety of uses for early settlers on the islands, having been used as cooking utensils and even trumpets.
So if you ever find yourself in the Maldives, take a look at the various wondrous sea-shells and see if you have the knowledge to identify their various kinds. The varieties you may discover are almost infinite.