10 Patella vulgata

10 Patella vulgata

Outer layer of shell eroded exposing underlying layer with ripples of concentrically arranged, iridescent blue crystals. L. 30.3 mm. Great Orme, Wales, July 2011. For detailed information about limpet shell structure, see Smith (2015). https://flic.kr/s/aHskjiP2GM .