SELLARDS.|] Fossil Plants, Upper Paleozoic, Kansas. Ald 
cordate, inequilateral, the lower side of the base being extended, 
separated by a distance of 5 or more mm. from the terminal 
pinnule. These lateral pinnules are succeeded below by the 
normal trifoliate pinnze of the species. Several specimens 
from the Le Roy shales have one pair only of small simple pin- 
nules before passing to the trifoliate pinne. 
Formation and locality: From the Cherokee shales to the 
Chase formation. 
CAR UBESH desorii Lx. Pl. XLVIII, fig. 11; pl. L, figs. 7-10; pl. LIV, 
fe. I 
Ultimate pinne linear, taper-pointed, compact, sloping grad- 
ually and regularly from near the base to the slender, obtusely 
rounded apex. Rachis slender, striate, marked by a depressed 
channel above, rounded and projecting below. Pinnules close, 
cblique, or becoming very open at the base of the pinna, sessile 
by the entire base, or the larger ones rounded slightly at the 
rachis, oblong, or ovate-oblong, apex very obtusely rounded, 
largest reaching a size of 14 mm. long, 6 wide, broadest at the 
base, reduced gradually but slightly to the rounded apex, 
or reduced more decidedly to somewhat pointed apex, slightly 
decurrent, touching, usually slightly connate with the pinnule 
below, reduced toward the apex of the pinna, becoming more 
distinctly connate, broader in proportion to their length, the 
obliquely inclined lobes at last passing into the faintly lobate, 
lanceolate, obtusely pointed terminal pinnule. Venation dis- 
tinct. The midvein of the larger pinnules is slightly decurrent 
at the base, enters the pinnule at or below the middle, and is 
traceable one-half the length of the pinnule. The lateral veins 
curve more or less in passing to the border, which they meet 
at an oblique, or sometimes somewhat acute, angle, forked two 
or three times at a rather broad angle, more or less flexuous in 
the lamina, 18 to 26 per centimeter. A few veins, two to 
four, from the rachis, supply the decurring base of the pin- 
nule. In the smaller pinnules the midvein becomes less con- 
spicuous. The several veins supplying the lobes arise from a 
scarcely thickened vein, curving down, and running for some 
distance nearly parallel to the rachis before uniting; lamina 
rather thick. 
This clearly marked species is abundant in the Lawrence 
shales. The normal shape and venation is shown in figures 
7 to 10, plate L, in which the numerous veins fork at a rather 
288. Neuropteris desorii Lesquereux, Journ. Bost. Soc. Nat. Hist., vol. 6, p. 418, 1854. 
