516 bR. NEWELL ARBER AND MR. F. W. LAWFIELD ON THE 
4. A Systematic Revision of the British Species of CALAMOPHLOIOS 
and DICTYOCALAMITES. 
Genus CALAMOPHLOIOS, Arber, 1916. 
(Phil. Trans. R. Soc., Ser. D, vol. 208. p. 140.) 
DiAGNOsIS. External surfaces of stems and branches of Calamites. Inter- 
nodes smooth or striated. Striæ not reticulate. 
Summary of British Species of CALAMOPHLOIOS. 
CC Upstarts eV BIBS (1 oan A 3 Sr p. 516. 
Ep onngsuns ASSI e ie Qi E e rope em Dol 
EOD TUMOUR AT IORD ori iavmu ven O p. 518. 
BUE QUeDHEP SADC! anar insae oraren Er Eee en p. 518. 
isan HOMME AIDC Gr. dA Idas ca cd EEE a e oe UI p. 520. 
BTE OM DES ALTO? I On cats TEES AT ICH VERS p. 521. 
T SOAM BLOG, GN ev ia. sot CO Ea ees py Olle 
Bis UML eS Aber. uses vb bale a CO em chr a gs p. 522. 
Bic DAP HAMURTUA ATDBE ror err otPER ERES rh ires p. 525. 
10/ Cr Suckowt, Arber oo... eerste ee c ved p pe p. 524. 
Tis Miscellaneoùs specimens’)... eee eye s S p. 525. 
CALAMOPHLOIOS BRITANNICUS, Weiss MS. (Plate 28. fig. 1.) 
1888, Lucalamites (Calamites) britannicus, Kidston, Ann. & Mag. Nat. Hist. ser. 6, 
vol. ii. p. 131, pl. 7. 
1909. Calamites britannicus, Arber, Foss. Plants, p. 73, fig. on p. 50. 
1911. Calamites britannicus, Jongmans, Anleit, Bestimm. Karbonpil. West-Europas, 
vol, i. p. 123, fig. 118 on p. 123. 
1915. Calamites britannicus, Kidston & Jongmans, Mededeel. Rijksopspor, Delfstoff. 
No. 7, p. 160, pl. 119. fig. 1; pl. 122. fig. 2, 
DiaaNosIs.— /nternodes usually broader than long or of about equal 
length and breadth. 
Bark with smooth surface, with shrinkage cracks or wrinkles. Cracks 
mostly transverse, short, deep ; but in the region of the node the cracks are 
vertical, well marked, and short. Sub-epidermal surface striated longitudinally. 
Leaf scars small, lenticular, approximated or slightly separated. 
Branch scars elliptical or oval, several on every node, irregularly distri- 
buted, distant. 
DESCRIPTION OF SPECINEN.— The specimen figured on P1. 99. fig. 1, slightly 
reduced, shows two nodes, and a complete internode exceeding 10 ems. in 
length and about 6:5 ems. in height. The surface has the leathery transverse 
wrinkles which occur also in the case of other species, e. g., C. undulatus. 
There is also a series of short vertical grooves or bark cracks immediately 
underneath the node. One root scar is seen on the higher, and a branch scar 
on the lower node. The surface is quite smooth, and there is no sign of 
