518 DR. NEWELL ARBER AND MR, F. W. LAWFIELD ON THE 
Sterzel * says that in his specimen leaf scars exist (Blattspuren vorhanden) 
and again that the leaf scars are indicated (angedeutet). We are, however, 
unable to see any trace of these organs in the British specimen. 
Distribution. 
Upper Coal Measures—very rare. 
Radstock coalfield (Somerset). 
CALAMOPHLOIOS RUGOSUS, Arber. (Plate 28. figs. 3 & 6.) 
1913. Calamites ramosus var. rugosus, Jongmans & Kukuk, Mededeel. R. Herbarium, 
Leiden, No. 20, p. 38, pl. 13. figs. 1-3. 
1915. Calamites carinatus var. rugosus, Kidston & Jongmans, Mededeel. Rijksopspor. 
Delfstoff, No. 7, pl. 41. figs. 1-3. 
1916. Calamophloios rugosus, Arber, Phil. Trans. Hoy. Soc. series D, vol. 208. p. 141, 
pl. 3. fig. 9. 
Diacnosis.—ZJnternodes long, usually longer than broad, rugose, with 
crowded, irregular, shallow pittings. Also very faintly or (?) strongly 
striated longitudinally. 
Branch scars, two on each node, very large with a very large central 
cavity, alternating in position. 
Leaf scars unknown. 
DESCRIPTION OF SPECIMENS.—The specimen figured on PI. 24. fig .3 shows a 
node with a fragment of a branch scar, and part of a long internode below. 
The surface of the internode is rugose, with numerous, crowded, irregular, 
shallow pittings. The rugose character is less marked here than in some 
other specimens. The sub-cortical surface is clearly striated longitudinally, 
as is seen immediately below the node. This ribbing is of the type met with 
in the pith cast of ?Calamites Cisti (see p. 525). A fragment of an inter- 
node of another specimen, showing the rugose surface more distinctly, is 
shown on PI. 28. fig. 6. 
Distribution. 
Transition Coal Measures—very rare. 
South Staffordshire. 
Middle Coal Measures—rare. 
Derbyshire; Yorkshire ; Kent. 
CALAMOPHLOIOS GOEPPERTI, Arber. (Plate 24. fig. 13.) 
1854. Calamites Goepperti, Ettingshausen, Abhandl. k.-k. Geol. Reichsanst. Wien, vol. ii, 
part 3, No. 3, p. 27, pl. 1. figs. 3, 4. 
1874. Calamites verticillatus, Williamsor, Phil. Trans, Roy. Soc. vol. 164, pp. 66 & 80, 
pl. 7. fig. 45. 
1875. Calamitina Gópperti, Weiss, Abhandl Geol, Specialk. Preuss, vol. ii. part 1, 
p. 127, pl. 17. figs, 1 & 2. 
* Sterzel (1898) p. 75. 
