1: palatal lip transparent; juvenile, labial varix and falciform mark not yet developed. 2: medial, narrow, blackish mark on head. 3: snout deeply bifid, with a few opaque-white marks. 4:  opaque-white, heart-shaped, anterior pedal mucous gland. 5: body behind tentacles is translucent greyish-white with yellowish areas. H. 2.6 mm. Menai Strait, Wales. September 2011.

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