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These worms live in U-shaped, rather tough, mud tubes. The adults are fairly easy to obtain, but ripe individuals are never abundant. The best collecting grounds are at Barnstable, Mass., although some animals are found in Hadley Harbor. They should be collected during the day at low tide, washed free of mud, and placed immediately in a bucket of sea water. The sexes are separate, and may be distinguished by the darker abdominal segments of the females.