from The Century Dictionary and Cyclopedia

  • In some systems of classification, a group of true craspedote medusans, typical acalephs, or ordinary jelly-fishes, corresponding nearly or exactly with Hydrophora of some and Trachymedusæ of other writers. See Trachymedusæ.
  • A division of opisthobranchiate gastropods, of small size and simple form, having no ctenidia, cerata, or other processes of the body-wall. The families Phyllirhoidæ and Elysiidæ represent this division: same as Abranchia .


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