It contained at that time the single genus Rhabdopleura, a minute animal dredged by Sars off the Lofoten Islands, and by Norman off the Shetlands.
At high water, except three tortuous and intricate channels which have recently been dredged to a sufficient depth to admit the passage of vessels, so as to obviate the long journey round the island of Ceylon which was previously necessary.
The numerous harbours are chiefly artificial, usually located at the mouths of streams, the improvements consisting of two parallel piers extending into the lake and protecting a dredged channel.
The depths of the Black Sea are lifeless, higher organic life not being known to exist below loo fathoms. Fossiliferous remains of Dreissena, Cardium and other molluscs have, however, been dredged up, which help to show that conditions formerly existed in the Black Sea similar to those that exist at the present day in the Caspian Sea.
Of safe dock frontage, the channel having been dredged for 6 m.
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