from The Century Dictionary and Cyclopedia

  • n. In De Blainville's classification of acalephs, a group of oceanic hydrozoans, provided with hollow vesicular organs which buoy them up and enable them to float.
  • n. In a restricted sense, an order or suborder of siphonophorous hydrozoans, represented by such forms as the Physaliid√¶: distinguished from the Chondrograda, as Velellid√¶. See cut under Physalia.


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