ABSTRACT
The respiratory exchange of the fresh-water crab Potamonautes is almost entirely localised in the gills.
This crab can respire and survive in water and in air.
In water the ventilation of the gills by the activity of the scaphognathite is indispensable to the maintenance of respiratory exchange.
In air the scaphognathite is unimportant; simple diffusion suffices to renew the supply of oxygen at the gills.
1
In Landolt Bornstein’s Physikalische und Chemische Tabellen the statement is made, based on the determinations of Hufner and Hagenbach, that under similar conditions oxygen diffuses in water in 12 hours to about the same extent as it diffuses in air in 1 second.
Copyright © 1931 The Company of Biologists Ltd.
1931
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