unusual spider

unusual spider

Observation - unusual spider - UK and Ireland. Description: This spider has been outside my front door for the past 2 or 3 weeks. It has this strange triangular pea-sized sac where its body should be (in the daylight the sac is a shiny dark grey). It this just an egg sac or is it a really odd kind of spider? I hav

This spider has been outside my front door for the past 2 or 3 weeks. It has this strange triangular pea-sized sac where its body should be (in the daylight the sac is a shiny dark grey). It this just an egg sac or is it a really odd kind of spider? I have never seen one like this before.