Medial, narrow, blackish mark on head. Juvenile; labial varix and falciform mark not yet developed. Tentacles have single white line which is continuous (1) or broken (2). H. 2.6 mm. Menai Strait, Wales, September 2011.
Medial, narrow, blackish mark on head. Juvenile; labial varix and falciform mark not yet developed. Tentacles have single white line which is continuous (1) or broken (2). H. 2.6 mm. Menai Strait, Wales, September 2011.