Most of the carnivorous slugs are marine, but the shelled slug is terrestrial, and found in GB. Its usual diet is earthworms, which may reveal something about the supposed victim in the story.

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(60x) 13DT + 3PB + PTPro; (G3) 7DT/MT; (G4) 3T + PB. System 8.1 to OS 10.5.8