Abstract
Argulus Foliaceus has a remarkably wide distribution, and is found throughout Europe. A. coregoni, which is another European form of the Argulidae, has been recorded in England from such localities as the Birmingham Canal; Barble, Leicestershire; Berkshire Trout Farm; the River Wharfe, Yorkshire; Tring Reservoirs; the Thames; the River Frome in Somerset; and the River Lune.