Sigillaria n. pl. (Rom. Antic.) Little images or figures of earthenware exposed for sale, or given as presents, on the last two days of the Saturnalia; hence, the last two, or the sixth and seventh, days of the Saturnalia.
... to hear that Brongniart thought Sigillaria aquatic, and that Binney considers coal a sort of submarine peat. I would bet 5 to 1 that in twenty years this will be generally admitted (An unfulfilled prophecy.); and I do not care for whatever the botanical difficulties or impossibilities may be. If I could but persuade myself that Sigillaria ... — The Life and Letters of Charles Darwin, Volume I • Francis Darwin
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