Spirorbis spirorbis - on Saw wrack (Fucus serratus)

Spirorbis spirorbis - on Saw wrack (Fucus serratus)

Observation - Spirorbis spirorbis - on Saw wrack (Fucus serratus) - UK and Ireland. Description: Small white spiral worm cases in clockwise spiral form, seen on Saw wrackl(Fuccus serratus)

Small white spiral worm cases in clockwise spiral form, seen on Saw wrackl(Fuccus serratus)