IT has always been supposed that the pneumatocyst of the Physophores is closed; but to-day I was able to observe the escape of the air-bubble from the air-cavity of a young Stephanomia bijuga, about 5 mm. in length. It had been placed in 50/50 magnesium chloride (7 per cent) and sea water to relax it; and the escape of the air-bubble took place some twenty minutes later. Twenty minutes after return to sea water, the air-cavity was 60 per cent full of air again.
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TOTTON, A. Pneumatocyst of the Physophores. Nature 164, 877 (1949). https://doi.org/10.1038/164877a0
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