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 Physaliidæ: distinguished from the Chondrograda, as Velellidæ. See cut under Physalia.
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