Aeolidiella glauca
Body translucent white and orange. Internal eyes visible. Front row of cerata forms a white ruff, but white zone in some cerata less than 50% of length. Anterior half of body copiously speckled with pale opaque pigment. Distance between oral tentacles about same as thickness of single tentacle base. White pigment speckles on oral tentacles, cerata and, distally, on rhinophores.
Length 23 mm. Menai Strait, Wales, February 2011.