fi'KMiAM.owl NORTH AMERICAN SPECIES OF DAHOXYLON 7S 



yn;/isr(T.«'\— Tracheids in regular, radial rows, rather uniform, 44x47 mic. 

 broad, the walls 9 mic. thick. Medullary rays numerous, 1— several 

 cells wide. 



}{adi(il. —Ray cells all of one kind, short, equal to 2-3 tracheids; conspicu- 

 ously and gradually narrower at the ends; the upper and lower walls 

 thin, not pitted; the terminal walls thin, not pitted, usually curved; 

 the lateral walls with bordered pits about G per tracheid, obscure, 

 the slit-like oriflc« diagonal. 



Bordered pits in one row, round and as broad as the tracheid; 

 the orifice lenticular. These structures are for the most part want- 

 ing, and when present are very poorly defined. 



T(iniH>itiaL~Ra.ys numerous, large, multiseriate, 2-4 cells wide, high; the 

 cells hexagonal and all very thin-walled. 



DaDOXYLOX riiOSSERI, 11. sp. 



This specimen from tlie upper part of the Chase Fornmtion (Per- 

 mian), was obtained by Prof. Prosscr from })otween sections 11 and l-o, 

 Cottonwood Township,, Cha^^e Co., Kansas, in 1897. The material is 

 very badly preserved, but as it seem.s to dilfer from the otliers of the 

 same fonnation, it is assigned a provisional name. 



/'/•«/(«(fv.sc.— Tracheids in regular radial rows, rathei rounded, 47x47 mic. 



broad, the walls 12.5 thick. Resin passages and special resin cells 



wanting. Growth rings none. 

 h'<i<li„l.-Ray cells all of one kind, equal to 3-4 tracheids; the upper and 



lower walls thin and not pitted; the terminal walls thin, not pitted, 



generally curved; the lateral walls with small, round bordered pits,' 



about 2-4 per tracheid. 



Bordered pits round, 12.5 mic. broad, in 1-2, chiefly 2 rows. 

 Ta„<,n,li,il.-Rays numerous, l-seriato or .somewhat 2-seriate in part, the 



round cells thin-walled, about 2.3 mic. broad. 



Dadoxyi.ox I■l)VAl!l)IA^■^^r, ])n. 



This species from the Lr.wer Tria.s at Indian Kiver, Prince Edward 

 Island,* is represented by badly preserved material from which the 

 original diagnosis was olitained. The material will not admit of any 

 exact confinnation of the diagnosi.s, which is here repeated provisionally. 

 " Trunks without distinct rings of growth, and with a central pith not 

 observed to have transverse laminae. Wood cells with one, or rarely two 

 rows of contiguous, hexagonal areoles. Medullary rays simple, infrequent' 

 with two to ten rows of cells superimposed.'" 



' Rept. on the Geol. Struct, and Min. Res. of P. E. Island, 1871 45 

 ' Proc. U. S. Nat. Mus., XIL, 1890, 615. 



