Subdorsally, the translucent mantle reveals obliquely aligned, embedded spicules and, dorsally, the blackish viscera. The mantle and its tubercles are liberally sprinkled with small black freckles and minute brown spots. When viewed from directly above against black viscera, the pale tubercles form light halos around their apical brown spots.
Length 6 mm. Orkney. March 1975. Det. B. Picton