Definitions

from The Century Dictionary and Cyclopedia

  • In Lamarck's classification (1801), one of two divisions of his conchiferous Acephalæa, containing the inequivalve bivalves and the brachiopods: opposed to Æquivalvia, 1.
  • In Latreille's system (1825), one of two divisions (called families) of pedunculate Brachiopoda, represented by the genus Terebratula: opposed to Æquivalvia, 2.

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