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Echinoids Ambulacra and interambulacra D An electric bulb placed inside a large modern Echinus shows up the differences between the ambulacra and interambulacra and shows the outlines of the plates and all the pores as w
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Document Date: 2013-08-18 13:22:47
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Echinoids Ambulacra and interambulacra D An electric bulb placed inside a large modern Echinus shows up the differences between the ambulacra and interambulacra and shows the outlines of the plates and all the pores as w