Seward. —The Anatomy of Lepi do dendr on aculeatum , Sternb. 373 
designated by Williamson Lepidodendron fuliginosum. This identification 
has since been confirmed by Kidston 1 and by Weiss 2 . 
The large stems from Arran named by Williamson 3 Lepiemdendron 
Wunschianum have been described as bearing Halonial branches, and for 
this reason they have been referred to the genus Lepidophloios 4 . It has 
been suggested that the Arran species may be specifically identical with 
Lepidodendron Harcourtii^ , but the evidence available does not justify 
a positive statement as to identity. 
The petrified specimens from the Lower Carboniferous beds of Petty cur, 
near Burntisland, on which Williamson founded the species Lepidodendron 
brevifolium 6 , in all probability possessed the external characters of L. Vel 
tkeimianum 1 . A recent discovery by Mr. Lomax enables us to refer 
Williamson’s type Lepidodendro?i mundum 8 to the genus Bothrodendron , 
and Dr. Scott has in his possession a specimen with the external characters 
of L. obovatum showing well-preserved internal structure 9 . 
Reference may be made to Lepidopldoios acadianus , Daws., and to 
Lepidodendron Derbyi> Ren., as additional examples of lepidodendroid 
plants in which internal structure and external features occur together. 
Sir William Dawson 10 described Lepidophloios acadianus in 1866 from the 
Canadian Coal-Measures, and an additional account of the species was 
published by the same author in 1897. 
An example of this species described by Dawson as a Halonial branch 
bearing two rows of cone-scars may be compared with the specimen recently 
dealt with by Weiss n , but the anatomical preservation of the Canadian 
plant, as represented in the somewhat rough sketches in the earlier paper 
and in the microphotographs by Prof. Penhallow in the later account, is too 
imperfect to enable us to attempt a satisfactory comparison with British 
anatomical types. 
Mr. Kidston 12 regards Lepidophloios acadianus as specifically identical 
with L. laricinus , Sternb. 
In 1890 M. Renault 13 proposed the name Lycopodiopsis Derbyi for 
a Brazilian specimen exhibiting external features and internal structure ; 
he described the anatomy of the central cylinder as differing in important 
characters from that of the Lepidodendron type. The acquisition of 
additional specimens from Brazil enabled M. Zeiller 14 to modify Renault’s 
interpretation, and to identify the species as a true Lepidodendron allied 
1 Kidston (,’93), p. 343 ; (’01), p. 58. 2 Weiss (’03), p. 218. 
8 Williamson (’72 2 ). 4 Kidston (’01), p. 59. 
5 Seward and Hill (’00), p. 921. 6 W 7 illiamson (72 2 ), p. 310. 
7 Kidston (’01), p. 60. 8 W 7 illiamson (’89). 
9 I am indebted to Dr. Scott for generously lending me his specimen of Z. obovattim for 
examination. [Since this was written, Dr. Scott has published a description of his specimen. See 
Annals , Vol. XX, p. 317, 1906.] 
10 Dawson (’66), (’97). 11 Weiss (’03). 12 Kidston (’86), 
13 Renault (’90), 14 Zeiller (’98). 
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