X] STYLOCALAMITES. 375 



reference should be made to Kidston\ Zeiller-, and other 

 authors. 



Casts of Galamites Suckowi are characterised by flat or 

 slightly convex internodal ridges separated by shallow depres- 

 sions, the ridges are rounded at the upper end of each intemode, 

 and usually bear circular casts of infranodal canals. There are 

 some unusually large examples of casts of this species in the 

 British Museum from the Radstock Coal- Measures ; one of these 

 has a length of 81 cm., and a diameter of 27 cm. Specimens 

 are not infrequently found with verticils of slender roots in 

 close proximity to the nodes of the cast ; figures of such root- 

 bearing casts have been given by Lindley and Hutton=*, Weiss*, 

 and other authors. 



Renault^ has drawn attention to the thinness of the layer 

 of wood which is often associated with large casts of C. Suckowi ; 

 he concludes that the stems must have possessed little or no 

 secondary wood. In a more recent work by Grand'Eury* 

 Galamites Suckowi is spoken of as having had wood of the 

 Galamodendron type, but as wood of this kind has not been 

 found in England, it is suggested that the plant may not have 

 assumed an arborescent habit until late in the Coal-Measure 

 period. During the Lower and Middle Coal-Measures, at which 

 horizon it commonly occurs in England, it may have been 

 herbaceous. This suggestion has little to commend it; the 

 close agreement between G. Suckowi from English and French 

 localities points to a plant of the same form, and we have no 

 satisfactory evidence as to any difference in stem-structure in 

 the two cases. 



Stur has figured a specimen of a Calamite cast, which he 

 compares with G. Suckowi, surrounded by a band of silicified 

 wood apparently of the Arthropitya type. From this and other 

 facts it would appear probable that some of the English stems 

 with the Arthropitys structure possessed casts referable to Gala- 

 mites (Stylocalamites) Suckowi. 



We are not in a position to speak with confidence as to the 



1 Kidfiton (93), p. 314; (86), p. 24. « Zeiller (8*»), p. 388. 



3 Lindley and Hutton (31), PI. lxxix. * Weiss (84), PI. iv. flg. 1. 



» Renault and Zeiller (88), p. 885. • Graud'Eury (90), p. 914. 



