Coryphella browni.
1: internal digestive gland.
2: wide, opaque white, subapical band of pigment.
3: pointed, unpigmented translucent apex.
4: base of opaque band often abuts onto red digestive gland.
5: sometimes, a translucent gap between opaque band and digestive gland.
Left: LWS, Menai Strait, Wales. February 2011. Right: sublittoral. Shetland. January 2021. © B. Arthur

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