370 



CALAMITES. 



[CH. 



lowest nodal constriction ; on the right of the pith-cast the broad 

 band of wood is faintly indicated by the smooth surface of the 



Fig. 100. Calamites (Calamitiiia) approximatus Brongn. Lower Coal-Measures 

 of Ayrshire. 

 X, impression of the wood. 



(Prom a specimen in the collection of Mr E. Kidston.) 



rock {x). Other examples demonstrating the existence of a broad 

 woody cylinder in Galamitina stems have been figured by Weiss' 

 and other writers, and some good examples may be seen in the 

 British Museum. 



We have so far noticed the connection of certain forms of 

 pith-casts {e.g. Calamites approximatus), and Asterophyllitean 

 shoots with stems of the sub-genus Galamitina. 



As regards the strobili our knowledge is far from satisfactory. 

 Stur= figures some fertile branches bearing long and narrow 



' Weiss, loc. clt. PI. XXI. fig. 5. 



- Stm- (87), PI. XI. fig. 1. 



