Angers, Société Linnéenne de Maine et Loire, 1869 [AND] Bayonne, Société des Sciences, Lettres et Arts de Bayonne, 1875. 8vo (24.0 x 16.0 cm). Text and plates, as follows: Le genre Meioceras (1869; pp. 17-31; one lithographed plate); 4 pp. letter to O. A. L. Mörch; 3 pp. synopsis (by Mörch); Monographie de la famille des Coecidae (1875; title page, pp. 3-31; one lithographed plate). Later dark blue buckram. Spine with gilt title.

Some rarely seen offprints and handwritten letter, together with a list of caecids, all by the French malacologist and founder of the series Les Fonds de la Mer, and micromollusc (especially Caecidae) specialist Alexandre Guillaume Léopold Marquise de Folin (1817-1896). The following items are bound in one volume, in this order: Le genre Meioceras; four-page signed and dated (20 February 1877) letter to O. A. L. Mørch, including a list of all 132 Caecidae species in de Folin's collection; three-page synopsis of the Caecidae (by Mørch); Monographie de la famille des Coecidae. The Danish clergyman Otto Andreas Lowson Mørch [Moerch, Mörch] (1828-1878) shared a keen interest in micromolluscs and enumerated the West Indian caecid species. Provenance: the second offprint has in the top margin a tiny label with the autographed name Mörch, and given the fact that a letter to Mørch, and a species list written by Mørch are included we believe that all are from Mørch's library. Later from the library of the American malacologist and malaco-historian Richard Irwin Johnson (1925-2020), who may have commissioned the (re)binding. Scattered spotting to the first offprint, otherwise very good, clean. A unique item.