Residual colour patterns revealed in molluscs from the Oxfordian of Cordebugle (Calvados).

(A, B) Pseudomelania brasili (Bigot, 1938), MNHN.F.A46213 (Bigot coll.). (A) in natural light. (B) under UV light. (C, D) Neocrassina ovata (Smith, 1817), MNHN.F.J10473 (Cossmann coll.). (C) in natural light. (D) under UV light. Seen under UV light, fluorescent areas correspond to areas with residual pigmentation while dark areas correspond to unpigmented regions. Scale bars: 10 mm.