This spider was found in a cave at Auchmithie when the Carnoustie Mob were on their Treasure Hunt. Identified as a European Cave Spider, either a Meta Menardi or Meta Bourneti, apparently a magnifying glass is need to tell then apart.
The white eggsac is teardrop shaped and hangs from a silk thread, the adult female in the picture shuns light but the baby spiders are attracted to it. This may be to disperse the young from the mothers territory.