[PENHALLOW] NORTH AMERICAN SPECIES OF DADOXYLON 75 
Transverse.—Tracheids in regular, radial rows, rather uniform, 44 x 47 mic. 
broad, the walls 9 mic. thick. Medullary rays numerous, 1—several 
cells wide. 
Radial.—Rays 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 6 per tracheid, obscure, 
the slit-like orifice 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. 
Tangential—Rays numerous, large multiseriate, 2-4 cells wide, high; the 
cells hexagonal and all very thin-walled. 
DADOXYLON PROSSERI, n. sp. 
This specimen from the upper part of the Chase Formation (Per- 
mian), was obtained by Prof. Prosser from between sections 14 and 15, 
Cottonwood Township, Chase Co., Kansas, in 1897. The material is 
very badly preserved, but as it seems to differ from the others of the 
same formation, it is assigned a provisional name. 
Transverse.—Tracheids in regular radial rows, rather rounded, 47 x 47 mic. 
broad, the walls 12.5 thick. Resin passages and special resin cells 
wanting. Growth rings none. 
Radial.—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. 
Tangential—Rays numerous, 1-seriate or somewhat 2-seriate in part, the 
round cells thin-walled, about 25 mic. broad. 
DADOXYLON EDVARDIANUM, Dn. 
This species from the Lower Trias at Indian River, Prince Edward 
Island, is represented by badly preserved material from which the 
original diagnosis was obtained. The material will not admit of any 
exact confirmation of the diagnosis, 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.’” 
1 Rept. of the Geol. Struct. and Min. Res. of P. E. Island, 1871, 45. 
2 Proc. U. S. Nat. Mus., XII., 1890, 615. 
