FIGURE 1. A in The works on echinoids by Klein and Leske, the confusion concerning the authorship of Klein (1778), and the problem of citation of some species

FIGURE 1. A: Title page of Klein's Naturalis Dispositio Echinodermatum, 1734. B: Portrait of Klein, aged 59 in 1743, from the French Edition, 1754. C: Title page of the1778 Edition of Klein's Naturalis Dispositio Echinodermatum. D: Title page of Leske's Additamenta, 1778. All from the author's copies of the original works. A, C, and D are Crown Quarto size, B is Crown Octavo.