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Anthopleura sola
The one in the photo was about 10 to 12 cm in diameter. It had sticky green tentacles.
Tide pools on coastal rock platforms. At low tide, may only be covered by a few centimetres of water. Column typically covered with shelly debris and retracts when not submerged.
Found in a tide pool on the rock platform at the north end of Kehoe Beach at Point Reyes National Seashore in California. Stripes on oral disc were fairly faint.
1 Comment
It looks like Anthopleura elegantissima
http://bit.ly/usqfEI -- this page has a great description