EXTERNAL MORPHOLOGY OF THE STEMS OF CALAMITES. 021] 
Distribution. 
Middle Coal Measures—rare. 
South Lancashire; Yorkshire; Derbyshire ; Kent. 
CALAMOPHLOIOS DISCIFER, Arber, (Plate 25. fig. 23.) 
1884, Calamites (Calamitina) discifer, Weiss, Abhandl. Geol, Specialk. Preuss, vol. v. 
part 2, p. 91, pl. 7. fig. 3. 
Calamites ( Calamitina) pauciramis, Weiss, ibid. vol. v. part 2, p. 98, pl. 11. fip; 
Calamites (Calamitina) pauciramis, Kidston, Trans. R. Soc. Edin. vol. xl. part 4, 
p. 789, pl. 4. fig. 36; pl. 5. fig. 44. 
Calamites. discifer, Jongmans, Anleit. Bestimm. Karbonpfl. West-Europas, p. 106, 
figs. 102, 103. 
1911. Calamites pauciramis, Jongmans, ibid. p. 105, fig. 101. 
1911. Calamites discifer, Kidston, Mém. Mus. Roy. Hist. Nat. Belgique, vol. iv. p. 105, 
pl. 10. fig. 6. 
1913. Calamites discifer, Jongmans & Kukuk, Mededeel. R. Herbarium, Leiden, No. 90, 
p. 33, pl. 14. figs. 2, 3. 
1915. Culamites discifer, Kidston & Jongmans, Mededeel. Rijksopspor. Delfstoff. No. 7, 
p. 75, pl. 58. fig. 4; pl. 61. fig. 4; pl. 62. fig. 3; pl. 65. fig. 2; pl. 67. figs. 2,3 
pl. 68. fig. 3; pl. 78. fig. 2; and text-figs. 41-44. 
1884. 
1903, 
1911. 
, 
Diacnosis.—Internodes of variable length, usually broader than long. 
Surface smooth, with very fine close longitudinal striations. Branch periods 
irregular. Branch scars of large or medium size, isolated, oval. Leaf scars 
circular, rather large, approximated, 
DESCRIPTION OF sPECIMEN.—Part of a stem showing several internodes is 
figured natural size on Pl. 25. fig. 22. This shows the surface of the inter- 
node and also a large branch scar. We are indebted to Dr. Kidston for this 
negative, which is taken from a specimen in his collection. 
Distribution, 
Middle Coal Measures—very rare. 
Canonbie ; Yorkshire. 
CALAMOPHLOIOS SACHSEI, Arber. (Plate 24. fig. 10.) 
1884. Calamites (Calamitina) varians Sachsei, Weiss, Abhandl. Geol. Specialk. Preuss, 
vol. v. part 2, p. 77. 
1887. Calamites Sachsei, Stur, Abhandl. k.-k. Geol. Reichsanst. Wien, vol. xi. part 2, 
p. 180, pl. 2. figs. 1, 3, 4 & 5; pl. 2n. fig. 2; pl. 5. fig. 1: pl. 11. fig. 1. 
1887. Calamites schatzlarensis, Stur, ibid. p. 164, pl. 13. figs. 10, 11. - 
1911. Calamites Sachsei, Jongmans, Anleit. Bestimm. Karbonpfl. West-Europas, vol. i. 
p. 89, figs. 87 & 88. 
1918. Calamites Sachsei, Jongmans & Kukuk, Mededeel, R. Herbarium, Leiden, No. 20, 
p. 29, ? pl. 12. fig. 4. 
1915. Calamites Sachse?, Kidston & Jongmans, Mededeel. Rijksopspor. Delfstoff, No. (f 
p. 60, ? pl. 56. figs. 5 & 6; P pl. 57. figs. 1-3 & 7; pl. 58. figs. 1, 3; pl. 60. 
figs. 2, 3; pl. 62. fig. 1; ? pl. 63. figs. 4-6; ? pl. 66. fig. 4. 
Dracyosis.—Internodes smooth, with a faint and very fine longitudinal 
sub-epidermal striation. Internodes usually broader than long. Periods 
