BERNARDI (A. C.). Monographie des genres Galatea et Fischeria. Paris: imprimerie de Louis Tinterlin et Cie, 1860. - In-4, 348 x 270 : (2 ff.), 47 pp. 10 plates. Black half-percaline, smooth spine, speckled edges (period binding). Uncommon first edition of this comprehensive monograph of all species and main varieties of the genus Galatea, considered a major reference for researchers and enthusiasts of aquatic fauna. Beginning with "Études sur le genre Galatea" by P. Fischer, the work, composed by A.-C. Bernardi, editor of the Journal de conchyliologie, includes a precise analysis of the morphological and biological traits of these species, while shedding light on their role within ecosystems. The edition is illustrated with 10 plates drawn and lithographed from life by Eugène Levasseur. Seven of these were colored by the lithographer and watercolorist Fortuné Delarue (1794-18?) and retouched with a brush by the author, giving them a highly realistic appearance. Spine damaged, partly unravelled and missing. Very good condition inside.