Above, a cinerous tortoise seen from above and below; middle, a galeated tortoise seen from above; below, a lettered tortoise seen from above and below. Etching by Hill.

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Above, a cinerous tortoise seen from above and below; middle, a galeated tortoise seen from above; below, a lettered tortoise seen from above and below. Etching by Hill. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.