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polypes of various sizes and colours, furnished with 

 feathery arms that radiate like the petals of a flower, and 

 are perpetually in motion, evidently for the sake of 



PLANTAIX MADREPORE. 



catching food. If touched, the polype contracts itself 

 into the soft, gelatinous film from which it had pro- 

 ceeded, and is only visible as a small and slightly pro- 



