398 University Geological Survey of Kansas. 
with sides parallel, or nearly so, and apex obtuse, attached by 
the truncate base, not at all connate at the base, or at most 
only slightly so, slightly arched transversely. The pinnules 
near the obtuse apex of the pinne are close, often touching, 
or but slightly separated, 5 to 10 mm. long, sometimes very 
slightly decurrent on the lower side of the base. Lower down 
on the pinna the pinnules become more distant, sometimes 
quite distinct, separated in some cases by as much as 1 mm., 
12 to 15 mm. long, 3 to 3.5 mm. broad. The base is sometimes 
slightly rounded, on the upper side at least. The veins leave 
the midrib obliquely, branch near the rachis, the upper branch 
rarely forking again in the small pinnules, more often in the 
larger. The veins are rather distant, 16 to 18 per centimeter 
along the border of the larger pinnules. The veins of the 
best-preserved specimens show a distinct thickening of the 
ends at the border—a character noticed on specimens of the 
species from Wettin,?*? as well as from Brive.?*4 
Formation and locality: Lawrence shales, Twinmound, and 
Le Roy shales, Lawrence. 
Pecopteris arborescens (Schlotheim) Brongn. Pl. XLV, figs. 3-5. 
Fronds very large, spreading, tripinnate, primary rachis 
strong, smooth or punctate, reaching a diameter of 2 cm. or 
more. Primary pinne large, open or oblique, alternate, 
crowded, sometimes overlapping, about 15 cm. distant, nar- 
rowly ovate, slightly contracted at the base, reduced to an 
obtuse apex, 40 to 50 cm. long, 10 to 20 broad; rachis strong, 
smooth or punctate; secondary pinne at right angles, or 
slightly inclined, alternate, or nearly so, close, 8 to 10 mm., 
but seldom touching, usually separated by a slight distance, 
linear, or narrowly linear lanceolate, 2 to 11 cm. long, 3 to 9 
mm. broad at the base, sloping very gradually to the apex. 
Rachis about 1 mm. wide, marked by a broad shallow depres- 
sion on the upper side. Pinnules at right angles, or nearly 
so, very close, usually mutually touching by their borders, or 
very slightly separated, not connate, except sometimes united 
slightly at the very base, 1.5 to 5.5 mm. long; 1.5 to 2.5 mm. 
wide, more or less strongly arched transversely, obtusely and 
regularly rounded at the apex, sessile by a truncate base. 
Texture rather thick and resistant, often obscuring the veins. 
283. Andra, in Germar: Verst. Steinkohlenf. Wettin u. Lobejun. 
284. Zeiller, Fl. de Brive, p. 14, pl. 5, fig. la. 
