Definitions for micraster
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Webster Dictionary
Micraster(noun)
a genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows
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"micraster." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/micraster>.

