ME. E. W. BINNEY ON SOME LOWEE-COAL-SEAM EOSSIL PLANTS. 
585 
The lunette-shaped extremities of the inner radiating cylinder of Diploxylo7i cycadoi- 
deum , as well as those in my specimen, remind us of a similar arrangement shown to 
occur in Stigmaria by Dr. Hooker, in plate 2. fig. 14*; and they appear to differ from 
those found in Sigillaria vascularis in not being divided from the central axis by a 
distinct line of demarcation, just as the same author’s Stigmaria fig. 5 differs from 
fig. 14. The exterior of the inner radiating cylinder of the former plant is more free 
and open, and not so sharp and compact as that of the latter plant. Indeed, from 
structure alone, it would appear probable that the first-named Stigmaria was the root 
of Diploxylon, whilst the last one was the root of Sigillaria vascularis. 
As Brongniart has preferred Corda’s name of Diploxylon to Anabatlira , and as the 
former is a more expressive generic term in my opinion, probably it is better to adopt 
it, and accordingly the specimen has been denominated Diploxylon cycadoideum. 
Description of Specimens Nos. 2, 3, 4, 5, 6, 7, & 8. 
The second specimen intended to be described in this memoir is from a small seam of 
coal about 2. feet in thickness in the lower coal-measures, marked ## in the vertical section 
previously given, and from the same seam that the specimens of Sigillaria vascularis , 
described by me in the paper published in the Quarterly Journal of the Geological 
Society previously quoted, came from, although from a different locality. This specimen, 
as well as those numbered respectively 3, 4, 5, 6, & 7, all came from the Halifax Hard 
seam, the Gannister coal, at South Owram near Halifax. It was found associated with 
Sigillaria , Stigmaria , Lepidodendron , Calamodendron, Ealonia , Diploxylon, Lepidostrobus, 
and Trigonocarpon, and other fossil plants not well determined in the order of relative 
abundance in which they have been just named. 
A portion of one of the specimens, a large Sigillaria , gave, on analysis f, 
Sulphates of potash and soda T62 
Carbonate of lime 45*61 
Carbonate of magnesia 26*91 
Bisulphide of iron 1T65 
Oxides of iron 13*578 
Silica 0-23 
Moisture 0*402 
The stratum found lying immediately above the seam of coal in which the nodules 
occurred was composed of black shale containing large calcareous concretions, and for 
about 18 inches was one entire mass of fossil shells of the genera Aviculopecten , Gonia- 
tites , Orthoceratites, and Posidonia. 
* Memoirs of the Geological Survey of Great Britain, vol. ii. part 1. 
t Eor this analysis I am indebted to the kindness of Dr. E. Angus Smith, F.E.S., 'who had it done in his 
laboratory by Mr. Browning. 
