r 



n 



,.^:, >■' -|1,'., 



12 CANADIAN FOSSILS. 



** Branching trunks, with distinct zones of growth, and a pith of the 

 Sternbergia type. Wood-cells very large, with three to five rows 

 of contiguous, alternate, hexagonal areoles with oval pores. Medul- 

 lary rays with one to three series of cells, and as many as fourteen 

 rows of cells superimposed on each other." 



Since the publication of my former papers, several additional specimens 

 of this tree from the St. John beds have been sliced and examined micro- 

 scopically, without showing any farther peculiarities of structure. It is 

 evidently an Araucarian Conifer, having regular hexagonal areolations in 

 the cell walls, enclosing rounded discs in which are placed oval oblique 

 pores resembling those of the Taxinese. Like some similar conifers in 

 the Carboniferous, it has a distinct Sternbergia pith. (PI. I, Fig. 15.) It 

 differs from the Carboniferous species of Dadoxylon in the great size of its 

 woody fibres and the more numerous rows of pores or discs on their 

 sides. 



The specimens found at St. John, in the so-called " Dadoxylon Sand- 

 stone," are partially carbonized, and partially silicified, calcified or pyritized. 

 The carbonaceous matter is anthracite, and in some places films of it have 

 the lustre and appearance of graphite. When the calcified portions are 

 acted on by a dilute acid, the carbonaceous matter can be recovered in a 

 pure state and capable of showing the fibres and their pores under the 



* 



In the following pages the subdivisions of the Devonian series will be 

 indicated by the letters U.D., M.D., and L.D. The names of Canadian 

 species are printed in Small Capitals. Allied species from New York and 

 other parts of the United States introduced for purposes of comparison, 

 are printed in Italics. As I have not copied in this Report any of the 

 figures published in my previous papers, or the remarks there made on 

 the localities and relations of the species, I have given references to ;?,^;:' 



these papers in the case of each species. In these references the initials 

 "J. G. S." indicate the Journal of the Geological Society of London. 



( Conifer ce, ^c.) 

 Genus Dadoxylon — Unqer. 



1. Dadoxylon Ouanqondianum, Dawson. — ( PI. I, Figs. 1 to 4 & Fig. 

 15.)— Canadian Naturalist VI, 165; Figures 1 to 4. J.G.S.XVIII, 

 306. Acadian Geology, 2nd ed. 535, Fig. 185.— M.D., New Bruns- 

 wick. 



f 



