what next? :shock:
That is very very bad news.
Give up any plans you had to keep a worm farm, I'm afraid. Do not touch them with your bare hands. Do not give anyone potted plants from your garden. They may even be notifiable in your area - check with Defra or equivalent in Eire.
As far as I am aware, there is no cure for them, only certain controls you can make. They are a litter dweller so you can clear up any leaf and other litter which will harbour them.
Have a look on Google for New Zealand Flat Worm and see what hints and tips you can come up with.