Later, Latham realised that only the use of the Linnean binomial system would give him the honour of originating the species' scientific names. Thus he published in 1790, a "Index Ornithologicus" where he specified a binomial name for all the species which he had previously described. However, it was too late, as Johann Friedrich Gmelin had already published his own version of Linnaeus' "Systema Naturæ" in which he gave a scientific name to Latham's species; taking into account the rules of nomenclature, Gmelin has priority. Nevertheless, there are around eighty bird species for which Latham's 1790 publication is cited as the authority. These include the emu, the black swan, the hyacinth macaw, the sulphur-crested cockatoo, and the noisy friarbird. A supplement to the "Index Ornithologicus" containing additional scientific names was published as "Supplementum indicis ornithologici sive systematis ornithologiae" with the year of 1801 on the title page. Although there is circumstantial evidence that the supplement was not available until 1802, for the purposes of zoological nomenclature the evidence for a later publication date has not been deemed sufficient to justify changing the year. Working from drawings, Latham appears to have had difficulty in distinguishing the different species and some he described more than once under different names. In his "Supplementum Indicis Ornithologici" he described the Australian noisy miner four times: as the chattering bee-eater ("Merops garrulus"), the black-headed grakle ("Gracula melanocephala"), the hooded bee-eater ("Merops cucullatus"), and the white-fronted bee-eater ("Merops albifrons"). This has caused some confusion in the ornithological literature as to the correct scientific name. Latham's 1801 Latin supplement is the authority for around seventy species of birds, almost all of which occur only in Australasia. They include the Pacific gull, the barking owl, the noisy miner, the Australian magpie and the magpie-lark. Beginning in 1821, when Latham was in his eighties, he published an expanded version in eleven volumes of his earlier work with the title "A General History of Birds". The ornithologist Alfred Newton later wrote that: "his defect as a compiler, which had manifest itself before, rather increased with age, and the consequences were not happy."