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These sea shells are shallow sandy bottom dwellers and feed mainly on
sea urchins and starfish. The Red Helmet is also known as Bull-mouth
Helmet. They are sometimes used for cameos.
The cameo is a carving in relief, originally done in colored layers of gemstone. However, most sea shells have three distinct layers of calcium carbonate that are often different colors. These shells were discovered to have layers of strongly contrasting colors and the shells were large enough to be perfect for carving cameos.