|Sea creature discs.|
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"Porpita is found in all seas. It is pelagic, floats on or near the surface. Its size ranges from 2 to 10 cm in diameter. It is regarded as an inverted polyp-its body is discoid and contains a flattened disc-like, chitinous shell. The shell contains many air filled chambers and functions as a float or pneumatophore. Each chamber opens to outside by a couple of pores."