492 THE CARBONIFEROUS SYSTEM. 



(b.) Var. angularis (Fig. 160), 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 irregu- 

 lar Avrinkles. This is sometimes invested with wood having the 

 structure of C alamo dendr on, 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. and H. 

 Many sandstone-casts, answering to the character of the plants 

 described under this name by Lindley, occur in the Upper Coal for- 

 mation. They are sometimes three inches in diameter, and several 

 feet in length, irregularly striated 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 Sigillarioid trees. 



Solenites, L. and H. 

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

 formation of the Joggins. 



For all the specimens noticed in the above list as collected by Sir 

 W. E. Logan, Richard Brown, Esq., of Sydney, Cape Breton, Henry 

 Poole, Esq., of Glace Bay, C.B., and Gr. F. and C. B. Matthew and 

 C. F. Hartt, Esqs., St John, New Brunswick, I am indebted to the 

 kindness of these gentlemen. To Mr Brown especially I am under 

 great obligations for his liberality in placing at my disposal his large 

 and valuable collection of the plants of the Cape Breton Coal-field. 



Summary. 



1. Of 196 nominal species in the list, probably 44 may be rejected 

 as founded merely on parts of plants, leaving about 152 true species. 



2. Of these, on comparison with the lists of Unger, Morris, and 

 Lesquereux, 92 seem to be common to Nova Scotia and to Europe, 

 and 59 to Nova Scotia and the United States. Most of these last 

 are common to Europe and the United States. There are about 54 

 species peculiar, in so far as known, to Nova Scotia, though there can 

 be little doubt that several of these will be found elsewhere. It would 

 thus appear that the coal flora of Nova Scotia is more closely related 

 to that of Europe than to that of the United States, a curious circum- 

 stance in connexion with the similar relationship of the marine fauna 

 of the period ; but additional information may modify this view. 



