Formerly, they were gener ally arranged amongst the Platyelminthes as 2 a sub-order in the order of the Turbellarians, but with the advance of our knowledge of these lower worms it has been found desirable to separate them from the Turbellarians and to look upon the Nemertina as a separate phylum.
The power of reparation, so conspicuous a feature of Turbellarians, is slight or absent in Cestodes.
One interesting observation is that the symbiotic and parasitic turbellarians produce many more eggs than the entirely free living species.
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