The world’s four famous conchs -- Bull’s-mouth Helmet (Cypraecasis rufa), Tang-crowned conch (Cassis cornuta), Trumpet’s Triton and Nautilus (Nautiloidea). They are precious conchs, with quite high ornamental and collection value. Nautilus is called “Parrot Conch” in China because it resembles a parrot’s mouth. It is a kind of ancient and rare conch, is called “living fossil”. It is a national key protection animal. The Western people made the world’s first nuclear submarine, the “Nautilus”, by imitates the way that Nautilus drains water and rises and sinks. The vitality of the Bull’s-mouth Helmet is very strong, the residents by the sea regard it as a symbol of health and longevity. There is a folk that collecting Bull’s-mouth Helmet to the home can help make money. Tang-crowned conch is a second-class national protected animal, commonly known as “Crown Conch”, because its shape is very like the helmet of the Tang Dynasty warriors of China. It is also one of the shellfish that often comes out in the exhibition. Trumpet’s Triton is called “Phoenix Tail Conch” in China because their appearance resembles the colorful tail feathers of peacocks, and because it is worshiped as a dharma object in Buddhism, they is also called “Dharma Conch”.