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. 130mm (measured on the on curve) on 85mm x 85mm slab. Proboscis is extended, showing the small teeth used to capture prey.

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