Two nautilus engraved and decorated in pen (cracks and very slight chips). The first depicts a couple and is dated "September 21, 1898"; the second is a bust portrait of a woman with the inscription "Hommage à notre mère chérie" ("Tribute to our beloved mother"). New Caledonia, late 19th century. Convict work, Height 12 cm - Length : 15 cm - Depth : 6 cm These two nautiluses illustrate a singular practice of the New Caledonian convict: ornamental engraving on Nautilus Pompilius shells. Meticulously crafted by inmates, these objects were often used as personal gifts. The first, adorned with a portrait of a couple, may have been given on the occasion of a wedding. The second, dedicated to a mother, bears witness to an intimate tribute. The monograms engraved beneath the portraits suggest a filiation between the subjects depicted.