SummaryThrough the help of many librarians, the author was successful in locating in European and North American libraries the Lieferung wrappers to Eugen Johann Christoph Esper'sDie Pflanzenthiere(1788–1830) as well as to hisFortsetzungen der Pflanzenthiere(1794–1806). These wrappers permit the numerical and signature collation of these two important works. Because of the rarity of these Lieferung wrappers and the poor quality of the paper on which they were printed which, at present, is in various deplorable stages of deterioration, the Nachricht, the Verbesserungen, and the Druckfehler are quoted in their entirety. For each respective Lieferung the complete collation of pagination and the respective plates as issued therewith are given. The value of this information resides in the fact that the plates and their respective descriptions were not issued simultaneously; it is only through the Lieferung wrappers that the relation between the text and the plates can be determined with certainty.