Abstract
some hundred and ten years ago, Dr Gotthelf Fischer, in a communication dated from Vienna, described a Nematode living in the swim-bladder of the trout. He named this worm Cystidicola farionis and his description is accompanied by some rough cuts. Bosc (1802) re-described the same Nematode under the name Fissula farionis. The same worm was again described by Rudolphi (1819) under the name Spiroptera cystidicola. Dujardin (1845) mentions it under the name Dispharagus cystidicola. Later it was removed by Schneider (1860) from the genus Spiroptera and placed in Diesing's genus Ancyracanthus. von Linstow uses this generic name “with a difference”; he spells it Ancryacanthus.
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