File:FMIB 41264 Sections of pearl shell shewing the thickening of the internal surface, opposite the point of attack of a boring mollusc, which.jpeg
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![File:FMIB 41264 Sections of pearl shell shewing the thickening of the internal surface, opposite the point of attack of a boring mollusc, which.jpeg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/44/FMIB_41264_Sections_of_pearl_shell_shewing_the_thickening_of_the_internal_surface%2C_opposite_the_point_of_attack_of_a_boring_mollusc%2C_which.jpeg/800px-FMIB_41264_Sections_of_pearl_shell_shewing_the_thickening_of_the_internal_surface%2C_opposite_the_point_of_attack_of_a_boring_mollusc%2C_which.jpeg?20150903121135)
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