London, Wheldon & Wesley, 1933-1935. 21 parts (including Appendices and Supplement) in four volumes. Thick 4to (27.5 x 21.0 cm). 1,726 pp.; portrait of the author. Original near uniform half cloth. Original, uniform printed wrappers bound in.

Only edition of a massive, mimeographed publication. "F.W. Mills will be a name likely to be most familiar to diatom enthusiasts, his publications on diatoms include a popular introduction (now back in print) and an important, comprehensive index to the genera and species" [this set] ..."His microscopy interests also included the foraminifera and botanical specimens" (Walker). "This index "was compiled solely as a reference work for my own use. It was originally based upon Hibershaw's Catalogue, but was discontinued for a time on the issue of Peragello's Catalogue in 1897. During the following thirty years I indexed all the new species, and noted alterations in nomenclature ... The index comprises of more than 500 genera, and probably more than 60,000 species and varieties, and over half a million references" (from the preface). Rare and very limited edition. Runs from A to Z, plus additions and a supplement. Boards worn (spines much less so), bindings shaky, front inner joint of first volume broken; otherwise a very good set. Stafleu and Cowan, 6066; Walker, D. (2020) Frederick William Mills, (1868-1949), on Microscopist net.