608 REVISION OF ARAUCARIOXYLON KNOWLTON. 



three to four rows, alternating, approximating or contiguous, small j 

 medullary rajs simple, usually of four to six, rarely one to eighteen, 

 superimposed cells. (Goppert.) 

 Permian formation. Chemnitz. 



7. Cordaites intermedius Grand'Eury Sp. 



Dadoxylon intermedium Grand'Eury. Mem. sur la Fl. carbonif. d. Dep. la Loire, 

 1877, p. 264. 



Tracheitis provided with three or four series of hexagonal pits ; me- 

 dullary rays composed of two layers of superimposed cells. (Grand- 

 'Eury.) 



This species is regarded by Grand'Eury as being intermediate be- 

 tween G. Brandling'ii and G. Acadian urn Dn. sp. 



Carboniferous. Central France. 



8. Cordaites Stephanense Graud'Eury Sp. 



Dadoxylon Stephanense Grand 'Eury. Mem. sur la Fl. carbonif. d. Dep. la Loire, 

 1877, p. 265. 



Tracheitis small, provided with one or two rows of pores ; medullary 

 rays not abundant, short, composed of a single layer of from one to 

 three small superimposed cells. (Graud'Eury.) 



Carboniferous formation, Central France. 



9. Cordaites Subrhodeanum Grand'Eury Sp. 



Dadoxylon Subrhodeanum Graud'Eury Sp. Mem. sur la Fl. carbonif. d. Dep. la 

 Loire, 1877, p. '266. 



Tracheids extremely small, provided with a single row of pores ; 

 medullary rays of from ten to thirty superimposed cells. (Grand'Eury.) 

 Carboniferous formation, Central France. 



10 ? Cordaites Acadianum Dn. Sp. 



Dadoxylon Acadianum Dawson, Can. Nat. 1863, Vol. viii, p. 433. Quart. Jour. 



Geol. Sec. Loud., 1866, Vol. xxn, p. 145, PI. v, rigs. 4-6. 

 Araucarioxylon Acadianum Kraus in Schimp. Pal. Ve"g., Vol. Ill, p. 577. 



Large trees, usually silicified or calcified, with very wide wood cells, 

 having three or more rows of small hexagonal areoles, each inclosing 

 an oval pore; cells of the medullary rays oue-third the breadth of 

 wood cells, and consisting of twenty or more rows of superimposed 

 cells in two series. Rings of growth indistinct. (Dawson.) 



Middle coal-measures, Joggins, Port Hood, Dorchester. 



11. Cordaites materiarum Dn. Sp. 



Dadoxylon materiarum Dawson, Can. Nat., 1863, Vol. viii, p. 433. Quart. Jour. 

 Geol. Soc. Lond., 1866, Vol. XXII, p. 145, PI. v, figs. 7-9. 



Wood cells less wide than those of A. Acadianum, with two to rarely 

 four rows of hexagonal pores. Medullary rays very numerous, with 



