Pisaura mirabilis or the "nursery web spider"

 This is a Pisauridae, Pisaura mirabilis I suppose, and it's a female carrying her eggs.

But where is she going? Well these spiders glue their eggs to plant leaves and make a web around as protection until the newborns will go out.

This is why they are sometimes called the nursery web spiders.
I put here other two pictures of the same spider.