522 DR. NEWELL ARBER AND MR. F. W. LAWFIELD ON THE 
usually short. Branch-bearing internodes short. Branch scars prominent, 
rather small or of medium size, quadrate, crowded. Leaf scars approximated, 
chain-like, small. 
DESCRIPTION OF sPECIMEN.—À fragment of a cast showing a very 
prominent branch-bearing node is seen on Pl 25. fig. 16, natural size. It 
also exhibits the smooth surface of the internodes. 
Remarks.—This species is not very clearly marked off from C. Goepperti. 
According to Kidston and Jongmans * (€. Goepperti is distinguished from 
C. Sachsei by its more circular and irregular branch scars and by the 
usually much shorter internodes, 
Distribution. 
Middle Coal Measures—very rare. 
Wyre Forest (North) ; Derbyshire : Yorkshire : Durham. 
Lower Coal Measures. 
Laneashire ; Fifeshire; Clackmannanshire. 
CALAMOPHLOIOS UNDULATUS, Arber. (Plate 29. fig. 4; Plate 24. 
figs. 15, 17, ? 14.) 
1884. Calamites sp., Weiss, Abhandl. Geol. Speciali. Preuss. vol. v, part 2, pp. 22, 27, 
pl. 17. fig. 2. 
1918. Calamites undulatus, Goode, Quart. Journ. Geol, Soc. vol. Ixix. p. 262, text-fig. 2. 
1918. Calamites cf. undulatus, Jongmans & Kukuk, Mededeel. R. Herbarium, Leiden, 
No. 20, p. 10, pl. 7. fig. 4. 
1915. Calamites undulatus, Kidston & Jongmans, Mededeel. Rijksopspor, Delfstoff. No. 7, 
p. 5, pl. 1. fig. 1; pl. 2. figs, 1 & 2; pl. 3. fig. 2; pl. 8. ? fig. 1; pl. 9. figs. 1-3; 
pl. 15. fig. 2; pl. 30, ? figs. 4 & 5. 
DiaGnosis.—Internodes with smooth surface with numerous transverse, 
discontinuous grooves or wrinkles, Sub-epidermal longitudinal striations, 
faint, very fine, ? discontinuous, sinuate. Branch scars rather small, ellip- 
tical or circular, approximated. Lea/ scars markedly elliptical, approximated. 
Root scars of varying size, elliptical or circular, abundant both on nodes and 
? the internodes. 
DESCRIPTION OF SPECIMENS.—Fragments of the external surface of two 
internodes are seen natural size on Pl. 24. fig. 15. This specimen, which 
was originally described by Mr. Goode in 1913, is remarkable for the fact 
that it shows both the external surface and the pith cast of C. undulatus. 
The internodes are quite smooth with close, very fine, wrinkles. Several 
? root scars are also seen on the internodes. 
Another specimen is shown natural size on Pl. 24. fig. 17. Here two 
nodes are seen, one of which bears a number of branch scars. The surface 
is again smooth, but there are numerous short, discontinuous, transverse 
grooves, The internodes also appear to be very finely striated longitudinally, 
* Kidston & Jongmans (1915) p. 57, 
