Melbourne, Charles Stuart and Co., 1890 and 1891.
Imperial folio, six volumes bound as three, with six individual title leaves, a few preliminaries as called for, a 30-page index and a page of errata at the end of the last volume plus the full complement of 303 full-page chromolithographic plates, each with a leaf of explanatory text (and often the original tissue-guard).
Contemporary gilt-ruled full brown morocco, all edges gilt; some wear to the extremities, and in particular the spines of the second and third books (the latter lacks the top third of its spine); scattered foxing (mainly light, but moderate in some cases in the second book); minor signs of use and age; overall, a decent set, possibly worth restoring.
The plate count per volume is, respectively, 52, 58, 48, 48, 50 and 47. Although it is complete, this set is sold as a collection of plates not subject to return.