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Project Noah Nature School
Purple spines, ~1.5 inches in diameter without the spines.
Tide pool/intertidal zone.
The final picture shows the test of a dead sea urchin. You can see its radial symmetry indicated by the dark bands encompassing the test (ambulacra). Those bands are where rows of tube feet were located.
Spotted on Jan 8, 2011
Submitted on Feb 26, 2011
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