396 University Geological Survey of Kansas. 
Aloiopteris winslovii D. W. Pl. XLIV, figs. 13-17. 
Aloiopteris winslovi D. W., Lower Coal Measures of Missouri, p. 
(2p {ole BBS oll, FB, wes; Wea, Ise, 
Fronds bipinnate, or possibly more. Rachis of the frond 
large, strong, marked with large circular or irregularly 
rounded puncte, 14 to 1 mm. wide. Primary (?) pinne alter- 
nate, at right angles, linear or linear elliptical, contracted 
gradually at the base, obtuse at the apex, bearing abnormal or 
Aphlebia-like pinnules at the base. Rachis finely lineate, some-. 
times having small puncte of the character of those of the 
main rachis. Ultimate pinne alternate, close, or a little dis- 
tant, free, 5 to 15 mm. apart, sessile, linear, obtusely rounded 
at the apex, slightly decurrent at the base, 2 to 12 or more cm. 
long, 3 to 7 mm. wide, oblique, or at right angles or reflexed,. 
borders divided into small segmented lobes by obtuse or acute 
decurring sinuses; larger pinne clearly distinct at the base, 
passing toward the apex into linear, oblique pinnules, 1 to 3 or 
4 cm. long, connate by the decurring lamina. Ultimate pinnez. 
toward the base of the primary pinne reduced, 1 or 2 cm. long, 
reflexed at an angle of about 45 degrees. Rachis flat or ob-. 
tusely rounded below, covered with a fine, scaly lamina, slightly 
decurrent at the base. Lateral nerves at a very open angle, 
strong, curved slightly at the base, simple, or forked once or 
twice, ending in the tips of the segments. 
A large slab from Thayer is partly covered with this species,. 
and shows the linear, serrate pinnules borne on a thick rachis. 
The pinnules are alternate, close, 4 to 8 mm. apart, open, many 
of them curving back, narrowly linear, slender, sloping a little: 
from the base to the obtuse apex, 2 to 7 cm. long. The large 
pinnules are clearly distinct, not united or decurring at the 
base. Near the apex of the pinna, however, the small pinnules. 
are united by a decurring wing. The midrib is comparatively 
strong and continues to the apex. The lateral nerves are very 
open, curving more or less from the midrib to the border, 
forked once in the smaller pinnules, usually twice in the larger.. 
The essential characters separating this species from A. erosa 
are apparently the broader and larger pinnules, with veins 
much more open, forking near the border. 
Formation and locality: Le Roy shales, Blue Mound; Law-. 
rence shales, Twinmound; Chanute shales. 
