166 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [DeC. 20, 



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

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



(c) Yar. distans, nsuaUy of smaU size, and with distant and irre- 

 gular wrinMes. This is sometimes invested with wood having the 

 structure of Calamodendron, and perhaps is not genencaUy distinct 

 from O. approocimatum. . , 



(d) Nir.ohsmra, with distinct and distant transverse wrinkles 

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

 the pith-cylinders of Sigillaria a^nd Lepidojohloios. 



Endogenites, L. & 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 3 inches in diameter, and several teet 

 in length, irregularly striated longitudinally, and invested with coaly 

 matter. Sometimes they show transverse striation m parts ot their 

 length. I believe they are casts of pith- cylinders of the nature ot 

 Sternhergia, and probably of Sigillarioid trees. 

 Solenites, L. & H. 



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

 formatioh of the Joggins. 



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

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

 Poole, Esq., of Glace Bay, C.B., and G. E. and C. B. Matthew and 

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

 kindness of those 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. 



EXPLANATION OF PLATES Y.-XIIL 



Illustrative of the Coal-plants of British North America, 



Plate V. 



Fig. 1. Dadoxylon antiquius: longitudinal section, radial, magnified 90 dia- 



2. The same:' longitudinal section, tangential, magnified 90 diameters: a, 



medullary rays. •/> j orn t 



3. The same : portions of cells showing areolation, magniliecl ^oU am- 



4. Dadoxylon Acadianum : longitudinal section, radial, magnified 90 dia- 



5. The same: longitudinal section, tangential, magnified 90 diameters: a, 



medullary rays. 



6. The same: portion of ceU showing areolations, magnified 2jU dia- 



7. Dadoxylon materiarium : longitudinal section, radial, magnified 70 



8. The same: longitudinal section, tangential, magnified 70 diameters: 



a, medullary rays. t nrrx j- * 



9. The same : portion of cell showing areolation, magnified 250 diameters. 

 10. D. annulatum : longitudinal section, radial, magnified 70 diameters. 



