[PENHALLOW] NORTH AMERICAN SPECIES OF DADOXYLON pi 
CORDAITES OHIOENSE, Dn., n. sp. 
Fig. 15. 
An undescribed species from New Lisbon, Ohio. 
Transverse.—Tracheids 47 x 56 mic. broad, the walls 12.5 mic. thick. 
Radial.—Ray cells chiefly short, about equal to two tracheids, straight or 
somewhat abruptly contracted at the ends; the pits on the lateral 
walls oval, with a prominent border, apparently 2 per tracheid, but 
not exactly determinable on account of extended decay. 
Bordered pits in 3-4 rows, sometimes 2 rows throughout the 
tracheid, hexagonal, about 12.5 mic. broad. 
Tangential.—Rays numerous, upwards of 25 cells high; broad, about 41 mic., 
conspicuously squarish, 1 or often 2-3 seriate in part. 
CORDAITES MATRIOIDE, Dn., n. sp. 
Dist. :—Douglas Mine, Grand Lake, and Mirimichi, N.B..; Port Hood and 
Mabou, C.B.; Joggins, N.S. 
This is an unpublished species embodied in Sir William Dawson's 
notes. The description there given places particular stress upon the 
thinner walls of the tracheids—a condition in reality resulting from ad- 
vanced decay—and the greater number of rows of bordered pits. ‘This 
latter, together with the number of pits on the lateral walls of the ray 
cells, really constitutes the point of differentiation from C. materiarium, 
and seems to constitute this a valid species. 
Transverse.—Tracheids about 56 x 56 mic. broad, the walls 12.5 mic. thick. 
Scattering tracheids contain resin. 
Radial.—Ray cells straight or somewhat contracted at the ends; the pits on 
the lateral walls oval, narrowly bordered, 1-8, chiefly 2-3 per 
tracheid ; the lenticular or oblong orifice nearly equal to the dia- 
meter of the pit. 
Bordered pits hexagonal, in 1-3, chiefly rows. 
Tangential.—Rays uniseriate or sometimes 2-seriate in part, upwards of 35 
cells high; the oval or round cells 25-31 mic. broad. 
CORDAITES ILLINOISENSE, Dn., n. sp. 
An unpublished species from the coal measures of Rock Island, 
Il}incis, and from the coal measures of Boonsboro, Iowa (?), the latter 
being designated in the collection of Sir William Dawson under the pro- 
visional name of D. missouriense. A third specimen appears in the 
