[845] Brongniart (282), p. 122, Pl. XXVI. figs. 1 and 2.
[846] Paterson (41), Pl. III.
[847] Göppert (52), Pls. III., V., VI., VIII., XXXVIII.
[848] Ettingshausen (66), Pls. I.–IV.
[849] Feistmantel (73), Pl. XIV. fig. 5.
[850] Zeiller (80), p. 17.
[851] Binney (68), p. 7.
[852] Stur (75), p. 3.
[853] Kidston (86), p. 35.
[854] Schimper and Koechlin-Schlumberger (62), Pl. I. The original specimens of Schimper’s figures are in the Strassburg Museum.