Coral Head

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Compound coral head with polyps partly expanded and partly contracted. The expanded polyps show the tentacles which surround the mouth; the contracted polyps show the polygonal outline from crowding.


Amadeus W. Grabau A Textbook of Geology (Boston: D.C. Heath & Co., 1920) 285


TIFF (full resolution)

2400×1484, 1.2 MiB

Large GIF

1024×633, 203.3 KiB

Medium GIF

640×395, 103.6 KiB

Small GIF

320×197, 32.4 KiB