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UNDERWATER GUIDE TO MARINE LIFE 



Fig. 29. Top. Pennaria, a form of colonial hydrozoan, is only an inch high and looks 

 like a Christmas tree. Each of the white knobs is the head of a single animal. The 

 tentacles are too slender to he seen. Bottom. Sea whip gorgonians, unlike most 

 anthozoans, "bloom" by day to capture their planktonic food. Each animal is barely 

 one-fourth of an inch in diameter. 



