EXTERNAL MORPHOLOGY OF THE STEMS OF CALAMITES. 529 
Fig. 8. Dictyocalamites Burri, Arber., Enlarged photograph of type specimen showing 
the reticulate ridges of an internode and root scars. 
Transition Coal Measures, Darfreston Boring, at 2559 ft., Kent. No. 2225, 
(x$) ; 
Fig. 9. Calamophloios majus, Arber. Reduced photograph showing the ridged internodes 
and a whorl of branch scars. 
Middle Coal Measures, Bonds Main Colliery, Temple Normanton, Derbyshire 
No. 3996. (x 4.) 
Fig. 10. CalamopAloios sp. Enlarged photograph showing the smooth internodes and a 
whorl of prominent branch scars. 
Lower Coal Measures, Trowel Colliery, Notts. No. 3967. (x 4.) 
PLATE 24. 
Fig. 11. Calamophloios Suckowi, Arber. The surface of the lower internodes is smooth, 
with a faint sub-cortical striation. Towards the upper end of the branch the 
characteristic pith cast of this species is exposed. 
Middle Coal Measures, Newthorpe Clay Pit, Notts. No. 3994. (Natural size.) 
Fig, 19. Calamophloios Suckowi, Arber. Enlarged photograph showing the external 
features of the internodes on the left-hand side and the pith cast on the right. 
Middle Coal Measures, Newthorpe Clay Pit, Notts. No. 4005. (x 3.) 
Fig. 18. Cal«mophloios Goepperti, Arber. Showing the smooth internodes with irregular 
vertical grooves, the leaf scars and a whorl of branch scars. 
Middle Coal Measures, Summit Colliery, Derbyshire. No. 3992. (Natural size.) 
ig. 14. Calamophloios undwlatus?, Arber. Finely ornamented bark of two internodes. 
Middle Coal Measures, Digby Clay Pit, Kimberley, Notts. No. 8993. 
(Natural size.) 
E 
3 
Fi 
m 
g. 15. Calamophloios undulatus, Arber, Showing the ornamentation of two internodes 
and root scars. 
Middle Coal Measures, Falling Cliff, Little Haven, Pembrokeshire. No. 2863. 
(Natural size.) 
Fig. 16. Calamophloios Sachsei, Arber. Showing the apparently smooth internodes and a 
` prominent whorl of branch scars. 
? Middle Coal Measures, ? locality, Derbyshire. No. 1996. (Natural size.) 
Fig. 17. Calamophloios undulatus, Arber. Showing the transverse furrows of an internode 
and a whorl of branch scars. 
Middle Coal Measures, Bretby Clay Pit, Derbyshire. No. 3991. (Natural 
size.) 
Fig. 18. Calamophloios verticillatus, Arber. Showing the longitudinally ridged internodes 
and a whorl of branch scars. 
Middle Coal Measures, Newthorpe Clay Pit, Notts. No. 2736. (Natural size.) 
Fig. 19. Calamophloios Cisti ?, Arber. Showing smooth internodes, with sub-cortical 
ridging. (Unfortunately turned upside down in reproduction.) 
Middle Coal Measures, Mattice Hill Boring, at 1276 ft., Sandwich, Kent. 
No. 2839. (Natural size.) 
Fig. 20. Dictyocalamites Burri, Arber. Enlarged photograph of the type specimen, 
showing a node and part of an internode with reticulate ridges and root scars. 
Transition Coal Measures, Barfreston Boring, at 2559 ft., Kent. No, 2225, 
(X 1$) 
