The 3 volumes of Bosc have separate records. Created for Ascidiacea: volume 3 only. [Do not use for Annelida: Polychaeta, which are only in volume 1, see
volume 1 source record] BHL have two sets of Bosc
World Polychaeta Database (WPolyDb)
BHL DOI links to a microfilmed copy, and the plates are only black & white. A second version is at
https://www.biodiversitylibrary.org/page/39123389 There is also a third BHL set (
Vol.1 link), but it looks like the plates have been removed from this copy
According to Graff (1899; p.3) the year of publication of this publication is 1801; the attached PDF is the second edition of 1830.