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[[preprinted]] 3

supposed to use the tube for the purpose of varying the amount of air in the chambers, in order to rise or sink. 

Family Argonautidae. No 2. 
The Paper Nautilus or Paper Sailor. This mollusk has been much confused with the Pearly Nautilus. Only the female is entitled to the name Paper Sailor, as she only produces a shell; the male being small [[strike through]] without shell [[/strikethrough]] and inconspicuous. The Argonaut is the only mollusk that is not