1878. | 323 {Lesquereux, 
tened by compression. The leaves are either at right angles to the stem or 
curved backwards from their point of attachment, nine centimeters long, 
gradually enlarging from the base, five millimeters, to the top one centi- 
meter wide, where they are rounded and obliquely truncate, the point 
slightly curved inside or concave as marked in the figure. Fig. 4° shows 
the point of attachment of the leaves observed upon another specimen. 
Habitat. Morris, Illinois, lowest bed of coal above the Millstone Grit ; 
found by Mr. 8. 8. Strong. One specimen with broken leaves, but distinct 
scars, is from Cannelton, by Mr. I. F. Mansfield. 
[COSTATA. ] 
Stems or branches irregularly costate by the prolongation of the base 
of the protuberant leaf scars, whose upper surface is covered by a smooth 
shining coating of coaly bark. 
CORDAITES COSTATUS, sp. nov. 
Pl. LI, figs. 1-4. 
Stem irregularly costate, leaves narrow, nearly linear, five millimeters 
broad above the point of attachment, gradually enlarged to nearly one 
centimeter at the point where they are broken ten centimeters from the 
base ; nervation distinct ; primary nerves unequal in distance, three to five 
in two millimeters, with three or four intermediate vinelets especially 
distinct on the under surface of the leaves; surface cross wrinkled ; flowers 
narrowly ovate, composed of appressed, imbricated, narrow, linear-lanceo- 
late, acuminate scales, sessile, upon long decurring cylindrical racemes. 
The branch, one and a half centimeters broad, bears as basilar support of 
the leaves, tumescent, reniform scars, fig. 2, narrowed at the base into 
a linear inflated support, which, after the disruption of the leaves, form, 
when persistent, narrow, carinate, alternate ridges, becoming sharply 
keeled and distinct in the old stem, as seen in fig. 3; or when destroyed by 
maceration, leave a cavity of the same size with elevated borders. The 
leaves are in an acute angle of divergence from the stem, somewhat loosely 
imbricated in spiral. Sometimes as seen in a, they appear decurrent by a 
casual flexion of the lower part to the stem. 
The flower bearing peduncles are cylindrical, apparently of hard tex- 
ture, slightly inflated, or like articulate at the point of attachment of the 
flowers which are sessile or with a very short pedicel. The form of the 
flowers is very different from that of the ones described from specimens of 
C. Mansfieldi and of C. communis. 
Habitat. We have three specimens of this fine species found by Mr. I. 
F. Mansfield, at Cannelton. 
[SERPENTES. ] 
Stems narrow, flexuous or serpentine, abruptly terminating into a large, 
flat leaf. 
