Lesquereux.] 320 [March 1, 
These leaves are found in most of the beds of our Carboniferous measures 
from the Millstone Grit to the Pittsburgh coal, where they are abundant. 
Not rare at Cannelton. 
CORDAITES COMMUNIS, sp. Noy. 
Leaves of various size, generally smaller than those of the former species, 
more evidently and generally attenuated to the base; the largest leaf seen 
of this species is twenty-two centimeters long, and thirty-seven millimeters 
wide at or near the top where it is broken ; fifteen millimeters broad just 
above the point of attachment, with border generally recurved. The 
upper surface is covered with a thick epidermis with distinct cross 
wrinkles. Primary nerves about three in two millimeters, obtuse and 
more obscure at the upper surface, distinct in the lower, with two to four 
intermediate veins. The nervation of these leaves is sufficient to separate 
them from the former species. 
One of the specimens represents a branch with leaves attached to it, and 
semilunar scars of those which have been destroyed. It bears also an un- 
folding branch, about in the same position as the one figured Pl. XLIX, 
fig. 2, but with shorter leaves, two centimeters long, more closely imbri- 
cated and more enlarged at the base, where they measure five to six milli- 
meters, and small cones (one only is distinct) with imbricated scales 
exactly like Cordianthus gemmifer, of Grand’ Eury, as figured Pl. XXV, 
for his illustration of the Cordaites. It is not possible to see the mode of 
attachment of the cone. 
Besides the character of the leaves the species differs from the former 
and from any of those described here by the thick bark covering its stem. 
It is nearly one millimeter thick, though the stems are flattened by 
compression. 
Habitat, Clinton, Missouri; found and communicated by Dr. J. H. Britts. 
CORDAITES DIVERSIFOLIUS, sp. nov. 
Pl. XLVI, fig. 3, 3a. 
Leaves narrow, linear, half embracing the stem at the point of attach- 
ment, twelve to fifteen millimeters broad, curved backward, except those 
of the top, which are closely imbricated, and in tuft. Surface distinctly 
marked by the nervation so that the primary nerves may be counted with- 
out glass. These are generally equal, obtuse, three to four in one milli- 
meter, with very thin scarcely perceptible intermediate vinelets. 
The specimen figured and mentioned above as the first found in this coun- 
try with leaves attached tothe stems, is from the Salem Vein, near Pottsville. 
The point of attachment is figured too large, the base being obscured or some- 
what covered by fragments of imbricated leaves. I have from this species 
separate leaves from Clinton, Missouri, one of which measures at the point of 
attachment seven millimeters, and is enlarged above it to eleven millimeters. 
CG: angustifolius, Lsqx. Ills. Rept., II, p. 413 (1866).* Name preoccupied by 
Dawson in Canadian Naturalist, 1861, p. 10. 
