THE CAKHONIl'EROUS. 



53 



above. Special attention is given to the protean varieties of Lepido- 

 dendron comtgatum, and to its Stigmaria roots, this being the 

 characteristic Lower Carboniferous Lepidodendron in America, and 

 our representative of the widely distributed L. Veltheimianum and 

 its allies in Europe,* and also to the conifers of the Lower Car- 

 boniferous and Millstone- grit. A list is also given, for comparison, of 

 the plants of the Middle and Upper Coal formation, and some inte- 



Fig. 5. — Wing of Blattina Bretonensis. 



— .Sc udder. 



Fig. 6. — Wing of Blattina Heeri. 

 — Seudder. 



resting new species from the former are described — more especially 

 Sigillaria Lorwayana, a species showing very beautifully the transverse 

 bands of fruit-scars so characteristic of some species of Sigillaria 

 (Fig. 4). In the paper on Sigillaria, it was my aim to define the 

 true place and structure of that genus, and also to separate Calamites 

 from Calamodendron. In connection with this I may mention that 

 the Cordaites, whose leaves are so abundant in both the Devonian 



7.— Wing of Blattina Sepulta. 

 — Seudder. 



Fig. 8. — LibeUula Carhonaria, 



— Seudder. 



and Carboniferous, and in the latter constitute the substance of some 

 thin layers of coal, have recently been shown by Grand 'Kury to 



* I see that in recent descriptions of the Lower Carboniferous plants of Greenland, 

 L. Veltheimianum is recognised ; but this is probably L. corrugatum, which for want 

 of sufficient specimens most European botanists bave not yet learned to discriminate, 

 nor have the Greenland specimens been yet compared with their American analogues. 

 Until this shall be done, we must remain in some uncertainty respecting them, not" 

 withstanding the good illustrations in European works. 



