OF COAL-MEASURE PLANT-IMPRESSIONS. 201 
Diagnosis of L. ophiurus, Brongn. 
Leaf bases approximated, separated by slight grooves, rhomboidal, promi- 
nent, always longer than broad, of small to medium size, 3-10 mm. long and 
2-5 mm. wide, lateral angles rounded, but still angular, upper and lower 
extremities straight or more rarely slightly curved. Leaf scar clearly 
marked, situated considerably above centre of leaf base, occupying nearly its 
whole width, upper and lateral angles acute, lower angle very obtuse. From 
the lateral angles two lines descend sometimes to near the lower extremity 
of the leaf-base, parallel to its contour and a short distance from its margin. 
Keel well marked or faint, usually without ornamentation, but sometimes 
with a few faint, short, transverse ridges. Keel above leaf scar prominent 
Prints of the leaf scar of the usual type, rather faint, sometimes invisible, or 
only a central print to be seen. 
4. LEPIDODENDRON LORICATUM, sp. nova. 
(PI. 13. figs. 27-37.) 
Bound up with the preceding species, at any rate to some extent his- 
torically, is another type of stem usually known as Lepidodendron dichotomum, 
Sternb., or L. dichotomum, Zeiller. This plant I now propose, for reasons 
which will be found fully stated below, to transfer to a new species as 
L. loricatum, sp. nova. 
Synonymy of Lepidodendron loricatum, sp. nova :— 
1838. ? Lepidodendron dichotomum, Presl, in Sternberg, Vers. Darstell. Flora Vorwelt, 
pt. 7, p. 177, pl. 68. fig. 1. 
1878-79. ? Lepidodendron dichotomum, Zeiller, Explie. Carte Géol. France, vol. iv. pt. 2, 
p. 107, pl. 72. fig. 1. 
1886-88. Lepidodendron dichotomum, Zeiller, Flore Foss, Bass. Houill. Valenciennes, 
p. 446, pl. 67. fig. 1. 
1903. Lepidodendron dichotomum, Arber, in Mem. & Proc. Manchester Lit. & Phil. Soc. 
vol. xlviii. No. 2, p. 20, pl. 1. figs. 1 & 2. 
1904. Lepidodendron dichotomum, Zalessky, in Mém. Com. Géol. St. Pétersbourg, N.S. 
Livr. 13, p. 9, pl. 2. figs. 3, 5, 6; pl. 3. figs. 3, 5, 7-12 ; pl. 4. fig. 11. 
1912. Lepidodendron dichotomum, Arber, in Phil. Trans. Roy. Soc. ser. B, vol. ccii. 
p. 251, pl. Li. fig. 6. 
1914. Lepidodendron dichotomum, Arber, ibid. ser. D, vol. ceiv. p. 402, pl. 29. fig. 36. 
Remarks on the Specimens previously figured. 
In the first part of Sternberg’s * Versuch,’ published in 1820, the first 
three plates relate to a Lepidodendron which the author termed L. dicho- 
tomum. Neglecting the third plate, we have already shown that most of the 
figures of plates 1 & 2 of that work are, in our opinion, identical with the 
other specimens figured in the following year by the same author as Lepido- 
dendron lycopodioides, Sternb. The latter name is thus, strictly speaking, a 
