FLORA OF THE CARBONIFEROUS PERIOD. 455 



ton Bluff, with Lepidodendron corrugatum, to which it possibly 

 belongs. A similar spore-case, possibly of another species of 

 Zepidodendron, occurs rarely in the Middle coal formation at the 

 Joggins. 



Sternbergia, Artis. 

 This provisional genus includes the piths otDadoxylon, Sigilhria, 

 and other plants, usually preserved as casts in sandstone, retaining 

 more or less perfectly the transverse partitions into which the pith- 

 cylinders of many coal-formation trees became divided in the pro- 

 cess of growth. These fossils are most abundant in the Upper 

 coal formation, but occur also in the Middle coal formation. The 

 following varieties may be distinguished : 



(a) Var. approximate/,, with fine uniform transverse wrinkles. 

 This is usually invested with a thin coating of structureless 

 coal. 



(b) Var. angularis, with coarser and more angular transverse 

 wrinkles. This is the character of the pith of Dadoxylon. 



(c) Var. distans, usually of small size, and with distant and 

 irregular wrinkles. This is sometimes invested with wood having 

 the structure of Calamodendron, and perhaps is not generically 

 distinct from C. approximatum. 



(d) Var. obscura, with distinct and distant transverse wrinkles, 

 but not strongly marked on the surface. This is the character of 

 the pith cylinders of Sigillaria and Lepidophloios. 



Endogenites, L. & H. 

 Many sandstone casts, answering to the character of the plants 

 described under this name by Lindley, occur in the Upper coal 

 formation. They are sometimes three inches in diameter and 

 several feet in length, irregularly striate longitudinally, and 

 invested with coaly matter. Sometimes they show transverse 

 striation in parts of their length. I believe they are casts of pith 

 cylinders of the nature of Sternbergia, and probably of sigillaroid 

 trees. 



SoLENITES, L. & H. 



Plants of this kind are found in the sandstones of the Upper 

 coal formation of the Joggins. 



For all the specimens noted in the above list, as collected by 

 Sir W. E. Logan, Eichard Brown, Esq., of Sydney, Cape Breton^ 

 Henry Poole, Esq., of Glace Bay, C. B., and G. F. and C. B. Mat- 



