Sociable worm Colony

Serpula socialis (Goldfuss 1831)
From the Jurassic,Bajocian stage.
Collected from Fiddlers Elbow,Cranham, Gloucester,England.
Very interesting piece of the sea bed.
 A section of inferior oolite with a serpulid sociable worm colony 
The only reasons for this behaviour, would be a safety in numbers aspect, and an abundant supply of food particles.This species is also referred to as Sarcinella plexus.
The whole specimen has been air abraded and measures 58mm x 64mm.