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DescriptionA long, dorsally flattened worm (between 5 -15 cm in length) with up to 200 segments. The eversible proboscis is long and cylindrical and covered in small, rounded papillae. The head has two large eyes, 5 antennae and 4 pairs of tentacular cirri, the longest of which may reach back to about the 7th segment. The paddles on the parapods are flattened, elongated and narrow to a point. The worm is bright to mid-green in colour.It breeds in July and August. It is thought to produce the green gelatinous egg masses found on the shore, usually attached to seaweed, although there is no evidence to corroborate this assumption (Fish & Fish, 1996).