EXTERNAL MORPHOLOGY OF THE STEMS OF CALAMITES. 525 
Distribution. 
Middle Coal Measures—infrequent. 
South Staffordshire ; Notts, and Derby ; Kent. 
MISCELLANEOUS specimens. (Pl. 28. fig. 10; P1.24. fig. 19 ; P1. 25. fig. 24.) 
In addition, we have seen several specimens, some of which are figured here 
to show the external features of the internodes, but which, for one reason or 
another, we have not been able to identify specifically. One of these is 
shown somewhat enlarged on Pl. 23. fig. 10. It is merely a fragment 
showing two nodes, one bearing branch scars. The internodes are smooth, 
with exceedingly fine, discontinuous and close longitudinal striations. 
Another specimen is figured on Pl. 24. fig. 19, natural size. The inter- 
nodes are here fairly long, and the surface is smooth though also finely 
striated longitudinally. The leaf scars are chain-like and small, and not 
very distinct individually. We are inclined to regard this example as 
possibly the external surface of Stylocalamites Cisti (Brongn.), but the specific 
determination is uncertain. Another, somewhat exceptional specimen is 
shown natural size on Pl. 25. fig. 24, which exhibits part of four internodes. 
One node shows two somewhat large branch scars, ill-defined as to their 
limits. The surface of the internodes is smooth, longitudinally wrinkled, 
especially near the node, and very finely striated longitudinally. The leaf 
scars are somewhat indistinct. "This specimen has been doubtfully referred 
by Kidston and Jongmans * to their new species C. pseudogermarianus. 
Kidston and Jongmans f. have also recorded from Britain the following 
species showing external features of Calamites, of which we have seen no 
examples from this country :— 
C. Wedekindi, Weiss. 
C. semicircularis, W eiss. 
C. dictyoderma, Kidst. & Jong. 
C. ohlsbachensis, Sterzel. 
C. Germarianus, Goepp. 
C. Schiitzei, Stur. 
C. jubatus, Kidst. & Jong. 
C. paleaceus, Stur. 
Genus DICTYOCALAMITES, Arber, 1912. 
(Geol. Mag. dee. 5, vol. ix. p. 97.) 
PraGNosis. Stems or rhizomes, with internodes possessing reticulate 
striations. Roots or root scars numerous, nodal or internodai. 
Remarks. When this fossil was first described from Britain, in 1912, no 
other similar example was known to us. We have since discovered that 
* Kidston & Jongmans (1915) p. 85, pl. 59. fig. 4 etc. T Lbid, (1915). 
