Naumann (1885) was translated by the authors for a 2013 issue of this journal. Two errors in translation were noticed after publication. One is a misquotation by Naumann of a formula Siebold applied. The other derives from a false surmise by the translators, because in the 2013 version we neglected to refer to Siebold's original text (Siebold, 1852) for confirmation. Moreover, the entire original text of Siebold had already been translated by Nomura (2013). In this paper, based on information from M. Nomura, two errors are corrected.