40c Nucella lapillus incomplete bore-hole on Patella vulgata (29.5mm long). Lleyn, North Wales. September 2015.

40c Nucella lapillus incomplete bore-hole on Patella vulgata (29.5mm long). Lleyn, North Wales. September 2015.

Insert: bore-hole lacks bevelled rim and has no raised central boss on base of incomplete hole; features found in holes bored by Euspira spp. , see flic.kr/p/4iUjmX (S. Roberts).

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