THE CAUBONIFEnOUS. 



53 



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

 dendron corrur/atinn, and to its Sligmarla roots, this being the 

 characteristic Lower Carboniferous Lcpidodendron in America, and 

 our representative of tlie widely distributed L. Vdlheimianum and 

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

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

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



Fig. 5. — Winy of Blaltina Brctuneuais. 

 — CScudder. 



Fig. G.— Wing q/'Blatlina Heeri. 

 — SciiildiT. 



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 



Fig. 7.— Wing of Bhittind Sepultd. 

 — Scudfler. 



Fig. 8. — LihelluJa Carhoncirid. 

 — Scudder. 



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

 thin layers of eoal, have recently been shown by (J rand 'Eury to 



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

 L. Vdthnmianum is recognised ; but this is probably L. corrugatu7n, which for want 

 of sufficient specimens most European botanists liave not 3'et learned to discriminate, 

 nor have the ((reenland spi^cimens been yet compared witii their American anahigues. 

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

 withstanding the good illustrations in European works. 



