WARD.] JURASSIC CYCADS FROM WYOMING. 413 
unbranched, broad at the concave base, terminating in an imperfect 
bud; rock soft on the surface, harder within, dark colored or bluish 
except a light weathered area, the specific gravity above the normal; 
organs of the armor at right angles to the oblique axis; rows of scars 
from left to right making an angle with the axis of 75° to 80°, those 
from right to left of 30° to 40°; leaf scars narrowly subrhombic, 
very small, 12 to 18mm. wide, 3 to 5mm. high; leaf bases dark, firm 
but porous; walls 3 to 5 mm. thick, of denser structure than the leaves, 
lighter colored, sometimes with darker stripes; reproductive organs 
doubtful and practically wanting ; armor 2 cm. thick, joined to the axis 
by a definite line ; wood 2 cm. thick, undifferentiated ; medulla ellip- 
tical, 3 by 6 cm. thick, smooth and homogeneous. 
It has been necessary to regard the nearly perfect, compact, and 
rather handsome little trunk, No. 500.16, as constituting a species by 
itself, and it is much to be hoped that other specimens of the same 
may be found. It weighs 2.18 kilograms. 
Pl. CLXII, Fig. 1, gives a gocd idea of it as seen from one side, and 
Fig. 2 shows the somewhat concave base. 
CYCADELLA CREPIDARIA Ward. 
Pl. CLXIII; Pl. CLXIV. 
1900. Cycadella crepidaria Ward: Proc. Wash. Acad. Sci., Vol. I, p. 280. 
Trunk small, elliptical in cross section, much vertically compressed, 
having the form, when inverted, of a shoe or moccasin, having a 
height (thickness) of 7 cm., a width (lesser diameter) of 12 em., and a 
length (greater diameter) of 19 cm., with two lateral axes nearly at 
right angles to the primary axis, the terminal bud forming a large 
raised area, the base projecting downward in a rounded protuberance; 
rock soft and coarse-grained, dark brown or nearly black, bluish 
within, of low specific gravity; organs of the armor mostly appressed 
or concealed; leaf scars where visible distorted and abnormal in shape, 
subelliptical, 12 to 15 mm. wide, 4 to 5 mm. high; leaf bases coarse 
and homogeneous in texture; walls 1 to 3 mm. thick, relatively hard 
and light colored; reproductive organs few, abortive or immature; 
thickness of armor unknown; wood 3 cm. thick; outer zone 1 cm. 
thick, coarse; inner zone 2 cm. thick, finer, and longitudinally striate; 
medulla elliptical, 3 by 5 cm. in diameter, coarse and homogeneous. 
No. 500.83 of Professor Knight’s collection, which constitutes the 
species, is in all respects a unique specimen, and notwithstanding its 
apparent deformity there is evidence that this is by no means wholly 
due to external agencies. The position in which the trunk grew no 
doubt had much to do with this, but it probably represents a dwarf, flat, 
branching species, all the members of which would present most of 
