Plates 287-390 have been attributed to Bruguière, but were attributed to Lamarck by Lamy (1930, cited in Evenhuis & Petit 2003). The BHL copy here linked, from Smithsonian Libraries, has the original title page of Part 21 dated "An VI" and volume 3 holds all the plates 287-388 issued y Lamarck.
Another copy, from Harvard, has the title pages issued in 1827 and follows the “Avis au Relieur” with a breakdown of pls. 96–314 in vol. 2 and pls. 315–488 in vol. 3.