The small dorsoventrally flattened head (1). Thick base (2) of cephalic tentacle bears an eye. Flesh that is rarely exposed is white (3). Base of large penis (4).
Left: H. 13.1 mm, Llŷn, North Wales, March 2016.
Right: Portland, Dorset, England, April 2012.
: flic.kr/p/2oiGpnC
Sets of OTHER SPECIES:
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