Murex pecten. Murex ternispina. Common to the Indo-Pacific region. Resembles the skeleton of a fish. No one knows the exact reason for the needle-like spines of this mollusk. Scientists have theorized that the spines are a protection against fish and other mollusks, and that the spines prevent the mollusk from sinking into the soft, sandy mud where it is commonly found. Measures approx 4"-5".