Ottoia prolifica

Middle Cambrian
Burgess Shale, Stephens Formation
Field, British Columbia
Canada

Ottoia is a predatory archaeopriapulid worm. Shells of small hyolithids are often found in the gut, showing that these animals may have been common prey. 110mm (measured on the curve) on 77mm x 68mm slab.

See: https://en.wikipedia.org/wiki/Ottoia