100 THE ROYAL SOCIETY OF CANADA 



"Special interest attaches to the important paper of Potpnié 

 on Bothrodendron partly because if this writer's view is accepted it 

 would minimize the value of a superabundance of Bothrodendron 

 remains as conclusive evidence of Devonian age for the beds that 

 contain them; and partly because the species described at length by 

 Potonié C. hercynianum, Weiss, shows a striking parallelism in most 

 of its features as far as they are known, to B. (C) Kiltorkense. C. 

 hercynianum occurs in the Tanner Grauwacke of the Hartz moun- 

 tains; these are strata that are regarded as Silurian by German 

 geologists . . . ;but it is difficult to accept the view that the 

 Bothrodendron Kiltorkense flora, which in all other parts of the world 

 where it occurs is predominantly a typical Devonian one, should in 

 the Harz mountains be a Silurian one . . . Even in the Middle 

 Devonian flora of Bohemia (H'') there are no distinct Bothrodendron 

 forms, though they contain certain young shoots probably belonging 

 to this genus (or to some other of the Arborescent Lycopods) 

 It is not inconceivable that the Devonian beds are pre-eminently rich 

 in such forms because the genus has in them reached its maximum 

 development, having begun in the earlier Silurian epoch. Bothro- 

 dendron is known to be waningly represented by several species in the 

 Middle and one in the Upper Coal measures. 



"Calamitoid Characters." 



Professor Johnson describes a number of specimens with fluted 

 stems like Calamités. 



Knorria Stage, 



"Knorria stages of this species have been published under C. 

 hercyniarium and K. acicidaris, and in some beds are the only rep- 

 resentatives of the species found. K. Bailyana is the Bergeria stage 

 of the two species. . . Heer expressly states that B. Kiltorkense 

 does not show Ulodendron {i.e. Bothrodendron) scars. 



Foliage 



Although stems of Bothrodendron {Cyclostigma) Kiltorkense have 

 been found in fair quantities and in all stages, in Ireland and elsewhere, 

 there is no record as yet of the occurrence of the stems with the foliage 

 leaves attached. It is thus evident that the leaves were deciduous 

 at an unusually early age of the shoot. Fortunately the specimens 

 already mentioned and named by Brongniart Lepidodendron Griffithii 

 and other specimens furnish the missing evidence and show how 

 distinct the foliage is from that of other species, such as Bothrodendron 

 punctatum and B. minutifolinm, in which attached more or less Ian- 



