Deutschlands freilebende Süsswasser-Copepoden. I Teil: Cyclopidae, II Teil: Harpacticidae, III Teil: Centropagidae, [IV] Nachtrag zu den Familien der Cyclopiden und Centropagiden, zugleich ein Begleitwort zu der Bearbeitung der Süsswasser-Cyclopiden und -Centropagiden im "Thierreiche".

Cassel, Theodor Fischer, 1892, and Stuttgart, Erwin Nägele, 1893-1898. Four parts in two. 4to (30.0 x 23.0 cm). [2], 192, [1], 103, 188 pp. (text part); 30 (8, 8, 14) fine lithographed plates (some tinted or partly coloured). Matching contemporary pebbled half calf over green cloth boards; spines with four raised bands, gilt ornaments to spine ends and bands, two text labels with gilt letters. = The best and rarest work of the German zoologist and botanist Otto Schmeil (1860-1943), based upon his dissertation. A second title to part II states that it is part of Leuckart & Chun's Bibliotheca Zoologica (not to be confused with the identically titled works by Carus & Engelmann, nor with the work by Taschenberg). Text and plates bound separately, but there is no separate title page to the plates. Instead there are separate title pages to the four parts. The plates are very well executed and entirely free of foxing. The Nachtrag has a pagination continuing from part III. Inscription by former owner on front paste-down of text part, stamp on title page (pasted over), Some rubbing to spine ends and hinges, otherwise a fine, clean set of this very scarce work with no other copies on the internet, nor any auction record in the last 30 years or more.