This is to say thank you very much to all the people on this list who e-mailed me regarding my sipunculid specimen. (General consensus is that it is a sipunculid.) I had over twenty replies so please forgive me for not acknowledging everyone individually.
In response to a couple of enquiries, I have taken another look at the specimen and cannot see any hooks on the introvert but the muscle bands do seem to run in both the longitudinal and horizontal, forming a rectangular pattern. The suggestion is that this might make it a juvenile Sipunculus nudus. This was my first thought on looking through Gibbs's British Sipunculans but the small size worried me.
S. nudus has not been recorded from Jersey before but Richard Lord e-mailed me to say that it is known from Guernsey, about 50km to the NW. See:
http://www.sealordphotography.net/Nature/Guernsey-marine-life-by/Belle-Greve-Bay-on-Guernseys/3514797_L9f6K#101457370_sV6Kx
For those that are interested, below is a list of sipunculid species that have been recorded from Channel Island waters:
Family Sipunculidae
Sipunculus nudus Linnaeus, 1766 Je?, Gu
Family Golfingiidae
Golfingia elongata (Keferstein, 1862) Je; Gu; He; Jet
Golfingia margaritacea (Sars, 1851) Je; Gu; He
Golfingia vulgaris (de Blainville, 1827) Je; He; Jet
Nephasoma minutum (Keferstein, 1862) Gu; Sk
Family Phascolionidae
Phascolion strombus (Montagu, 1804) Al; Breq
Thank you again,
Paul Chambers
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