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Biol Bull 134: 87-95. (February 1968)
© 1968 Marine Biological Laboratory
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THE PERMEABILITY OF THE EPIPHRAGM OF TERRESTRIAL SNAILS TO WATER VAPOR

JOHN MACHIN 1

1 Department of Zoology, University of Toronto, Toronto 5, Canada

1. A method for the measurement of epiphragma permeability is described.

2. Permeability coefficients varied greatly, depending on the water content of the epiphragm.

3. Permeability coefficients of epiphragma from different species of snail were similar at a given water content.

4. Experiments using models with thick and thin epiphragma indicated that evaporative loss in still air was not always related to epiphragm permeability in a simple manner.

5. Conditions under which epiphragm permeability provides a reasonable indication of evaporative loss in the intact snail are indicated.




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J. Machin
Osmotic Gradients across Snail Epidermis: Evidence for a Water Barrier
Science, February 22, 1974; 183(4126): 759 - 760.
[Abstract] [PDF]


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