L. cancellatus. Length 8.6 mm when live.
Head (1) has large transverse slit-mouth with wrinkled lips, surrounded by white hood.
Mantle cavity (2) contains pink ctenidia (3) at posterior (merobranch arrangement). The mantle fold (4) is unobtrusive Anus(5) on papilla opens into mantle cavity at posterior.
The foot has a small projection (6) either side of the anal papilla. The sole is whitish pink centrally, becoming reddish pink towards the periphery.
Llŷn, North Wales. March 2016.