These two drawings are reproductions, with variations, of two drawings by Jacques, kept at the BnF, having been engraved by Pierre-Etienne Moitte (1722-1780). The marten, whose drawing is dated 1756, corresponds to plate XVIII of volume VII, published in 1758.
Tentamen herpetologiae by Jacobo Theodoro Klein, 1685-1759 and Johann August Unzer, 1727-1799. Engraver: Jan Wandelaar, 1690-1759. Published by Leidae & Gottingae, Apud Eliam Luzac, Jun.,1755. | src BHL ~ Biodiversity Heritage Library
un regard oblique 