from The Century Dictionary.

  • noun A genus of irregular clypeastroid seaurchins, of the family Mellitidæ.
  • noun It is notable for the massiveness of the calcareous test, and has a large lunule between the posterior ambulacra, in addition to five incisions opposite the ambulacra, as in E. emarginata. The mass of the test is greatest in E. grandis, a species of the west coast of Mexico.


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