Whereas it is well known that most organisms cannot survive sudden large changes in the salinity of the external medium yet estuarine organisms have developed powers of resistance to them. Recent work, particularly that of Schlieper (1929), has thrown some light on the behaviour of estuarine animals in diluted sea water.

1

This organism agrees perfectly with the description (Whitehead, H., 1921), although it has been suggested that it is restricted in habitat to high land in a manner similar to Planaria alpina (Hubault, 1927).

Copyright © 1931 The Company of Biologists Ltd.
1931
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