s the combination Lepidopteris Ottonis—Antholithus Zeilleri may seem somewhat 
NÅ Bod Gb, I will begin by pointing out that there are several facts which speak 
for their belonging to the same plant. This cannot, however, be fully proved. 
The investigation was commenced some years ago by Prof. A. G. NATHORST who, 
however, was prevented by other work from completing it. In the course of his 
researches he already noticed the great conformity between the frond and the male 
reproductive organ here treated, and I have only had to continue on the way staked 
out by him. 
I am very much indebted to Professor NATHORST for his kindness in placing 
this interesting material at my disposal, and I have also to express my deep grati- 
tude to him and to Dr. T. G. HALLE for a great deal of good advice and directions. 
Lepidopteris Ottonis (Görrert) ScHimeEr. 
BISSAlN.2 
? "Teile von einem Farnkraut", BErRGErR 1832, p. 10; pl. 2, fig. 4. 
Alethopteris Ottonis, GÖPPERT 1836. p. 303; pl. 37, figs. 3, 4. 
Pecopteris? Ottonis, PRESL in STERNBERG 1838, p. 161. 
Lycopodites Meyerianus, GöPPERT 1845, p. 201. 
Pecopteris Ottonis, GöPPERT 1845 a, p. 144; pl. 1, figs. 4—10. 
<Farn-Wedel", ScHLÖNBACH 1860, p. 525; pl. 4, fig. A. 
Pecopteris Grumbrechti, Brauns 1866, p. 244; pl. 36, figs. 1, 2. 
Asplenites Ottonmis, ScHENK 1867, p. 53; pl. 11, figs. 1—3; pl. 14, figs. 3—3. 
Pecopteris Grumbrechti, ScHIMPER 1869, p. 5335. 
Lepidopteris Ottonis, SCHIMPER 1869, p. 574. 
Asplenites Ottomis, RÖMErR 1870, p. 178; pl. 13, fig. 1. 
<Fossila ormbunkar", ERDMANN 1873, p. 203; pl. 18, figs. 1, 1a, 1b. 
Asplenites Ottomis, NATHORST 1866 a, pp. 30, 39, 40. 
Lepidopteris Ottonis, NATHorsT 1878, pp. 10, 29; pl. 1, fig. 4a; pl. 2, fig. 1. 
Pecopteris simplex, NATHorsT 1878, pp. 10, 29; pl. 5, fig. 2. 
Aroides? Erdmanni, NATHORST 1878, pp. 12, 21. 
Lepidopteris Ottomis, NATHoRST 1878 a, pp. 7, 12; pl. 1, fig. 5. 
Lepidopteris Ottonis, ScHIMPER 1879 in ScHENK & SCHIMPER 1890, p. 128. 
Lepidopteris Ottonis, NATHorRsT 1886, p. 117; pl. 26, figs. 8—10. 
Lepidopteris Ottomis, ZITTEL 1890, p. 128. 
Lepidopteris Ottonis, GoTHAN 1909, No. 110; figs. 1, 2. 
Lepidopteris Ottonis, ERDMANN 1910, p. 21. 
Lepidopteris Ottomis, NATHORST 1910, pp. 12, 35. 
