Author: d'Archiac, [É. J. A. D. de Saint-Simon], Vicomte
Title: Observations sur le groupe moyen de la formation Crétacée.
Description: Paris, Société Geologique de France, 1839. Large 4to (31.8 x 25.0 cm). [iv], 51 pp. Disbound. = A little known publication by the french palaeontologist Étienne Jules Adolphe Desmier de Saint-Simon, Vicomte d'Archiac (1802-1868). It contains annotated lists of species, which include a new brachiopod, and a new ammonite. None are figured. Published in the society's Mémoires, volume 3, number VIII. A very good, clean copy.

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