of some Coal Measure Plants. 415 



other cases may bear considerable resemblance to the mesophyll 

 of the Calamites. Tissue of the latter type has also been de- 

 scribed by Renault* in L. esnostense, where it has the form of 

 chains of cells with numerous interspaces and united by short 

 transverse branches. 



In material from Shore, Littleborough, Lancashire, leaves 

 have been found which are probably identical with a type de- 

 scribed by Felix f from Westphalia some time ago. There is no 

 record of their previous discovery in this country, and as yet their 

 affinities are uncertain. It seems probable that they belong to 

 some species of Lepidophloios. They are about 6 mm, across, and 

 fragments over 3 cms. long occur. In these the mesophyll appears 

 differentiated into spongy tissue and pallisade cells, and thus more 

 closely resembles that of the higher plants. 



In so far as the present work has progressed there would 

 appear to have been considerable variety in the assimilating 

 systems of the different members of the Carboniferous flora, and 

 these may be closely compared with those found in living plants. 



* Eenault, Flore fossile d'Autim et d'Epinac, Paris, 1896, p. 179. 



t Felix, J., Westphalischen Carbon Pflanzen, Berlin, 1886, Taf. v. fig. 6. 



27—2 



