The soldier crab, in its shell and out of its shell;; the hermit crabin its shell and out of its shelll; bottom, the land crab. Coloured etching by J. Chapman, 1800.

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The soldier crab, in its shell and out of its shell;; the hermit crabin its shell and out of its shelll; bottom, the land crab. Coloured etching by J. Chapman, 1800. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.