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This device has probably made it possible for some species to grow to a length of
18 metres (59 feet). Some siphonophores (Coelenterata) have a chambered, gas
-filled float, its walls stiffened with a chitin-like structure in Velella.
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review