Manchester Memoirs, Vol. li. (1907), No. 7. 5 



view that they act as respiratory organs by keeping open 

 a free passage between the outside air and the inner 

 tissues of the plant. 



Parichnos strands in a fairly good state of preservation, 

 and very similar to the above have been described and 

 figured by Seward and Hill in their paper " On the 

 Structure and Affinities of a Lepidodendroid Stem from 

 the Calciferous Sandstone of Dalmeny, Scot., possibly 

 identical with Lepidophloios Harcourtii (Witham,)" 

 published in the Transactions of the Royal Society 

 Edinburgh, vol. 39, part 4. 



