520 DR. NEWELL ARBER AND MR. F, W., LAWFIELD ON THE 
Middle Coal Measures—infrequent. 
Kent; Wyre Forest (North) ; Warwickshire; Yorkshire. 
Lower Coal Measures—very rare. 
Yorkshire ; Ayrshire. 
JALAMOPHLOIOS MAJUS, Arber. (Plate 28. figs. 5, 7 & 9; Plate 26. 
fig. 22.) 
1874. Cyclocladia major, Feistmantel, Paleontogr. vol. xxiii. part 1, p. 96, pl. 1. fig. 8. 
1884. Calamites (Calamitina) extensus, Weiss, Abhandl. Geol. Specialk. Preuss. vol. v. 
part 2, p. 87, pl. 4. fig. 2. 
1889. Calamitina (Calamites) varians var. inconstans, Kidston, Trans. R. Soc, Edinburgh, 
vol. xxxv. part 2, p. 398, pl. 1. figs. 1 & la. 
1911. Calamites extensus, Jongmans, Anleit. Bestimm. Karbonpfl. West-Europas, vol. i. 
p. 91, fig. 89 on p. 91. 
1915. Calamites Goepperti, Kidston & Jongmans, Mededeel. Rijksopspor. Delfstoff. No. 7, 
p. 51, pl. 55. figs. 1, 3, 4; pl. 56. figs. 1, ? 2, 4; pl. 81. fig. 4; pl. 135. figs. 1 & 2; 
pl. 186. fig. 1. 
Draanosis.— Znternodes strongly and coarsely striated longitudinally, very 
variable in length, often a little or distinctly shorter than broad. Periods 
6-14, the shortest internode being above the branch-bearing node. 
Branch scars of medium size, usually crowded, approximated, more or 
less quadrate, the angles sometimes rounded, 
Leaf scars small, chain-like, oval, circular, or semi-circular, approximated. 
DESCRIPTION OF SPECIMENS.—A large specimen, 72 cms. across, is seen 
half the natural size on Pl. 28. fig. 5. Here there are more than five 
internodes in the period which is, however, incomplete, The internodes 
are broader than long and are distinctly striated longitudinally, the striae 
being broad and flat. The leaf sears are only faintly preserved. The 
branch scars are rather small, crowded, and the branch-bearing internode is 
very short. 
One or two internodes from a smaller specimen, 2 ems. across, are shown 
on PI. 28. fig. 7, enlarged 13, to show the nature of the ribbing. The leaf 
scars are also indistinct here. 
Part of a large stem, 11 ems. broad, is represented half natuval size on 
Pl. 23. fig. 9. It shows a node and three complete internodes. The latter 
are elearly striated longitudinally, as is seen from a part of one of the 
internodes shown natural size on Pl, 25. fig. 22. The leaf scars are again 
indistinct. 
Remarks.—Kidston and Jongmans* unite the specimens here termed 
C. majus with C. Goepperti. We, however, are inclined to maintain both 
species, for we have seen no conclusive evidence that the type here called 
C. majus is a partly decorticated example of C. Goepperti, which it must be 
if the two species are really identical. 
* Kidston & Jongmans (1915) p. 56, 
