quote:

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"As noted by Evenhuis (1997a: 212), the plates were sold as each one was ready. Therefore
the dates indicated above are those in which the completed volumes were first sold
or noticed.
The ICZN (1957a) ruled in Opinion 474 that the date of publication of the index,
published with the second volume of Drury’s work in 1773, containing names formed
in accordance with the principles of binominal nomenclature, is the official date of publication
of the species described and figured but not so named in the first volume issued
in 1770. Although published with the second volume, the index is often bound with the
first volume."

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