396 OLDER MESOZOIC FLORAS OF UNITED STATES. 
The weights of the specimens are as follows: 
Kilograms. 
ING 50023 heparan hada emia ra Se ae Sir acene ee eb asesee 11. 03 
INO DOO Ei cotstatcecvst crate lata coreneeciccic potato senna te wt tapanalcncveaeda taken ae eee vero aS 2.41 
IN@3:50028 ene serene ceases esas eusxeeewete se ewe eset eecie 1.28 
NO: DO014...pos.cco ncn eaeeeeenees ce seeeewee se eee ees 12. 00 
ING: DOO os cckecuntweclein eisai Shia ene eaewe eee TEE 8.89 
ING: 000920) sce delyses eee ieee neon Soe eels aisveeeaeee 3.57 
SING: SOOO R ZO St sterner wsc fey Sper auhcenvartactetatogsusncneree pad aul iy ecgse enn oo Ment, 4.00 
No. 500.52 -.-.-- dasa iw Reaves puaenis eeu wea cstaten Siemens iow raierodnaretasaninetons 1.13 
NO: D00S67 oeyrrzeee nme eee cade oo eeeeee secs 0. 40 
Pls. LX XIX and LXXX illustrate two of the sides and the base of 
No. 500.8. Pls. LXXXI to LX XXIII do the same for No. 500.14. In 
Pl. LXXXI, which is a side view of No. 500.14, the distinction between 
the parts covered with the ramentaceous cortex on the right and those 
from which this has peeled off on the left, with the exposed edge of this 
layer; is clearly brought out. In Pl. LX XXII the compressed leafy. 
summit of the trunk, broken down on one side, is made clear, and the 
circular area near the top represents the probable eccentric terminal 
bud or end of the main axis with small scars. Pls. LX XXIV and 
LXXXV show the broadest side and the base of No. 500.15. Pls. 
LXXXVI to XC illustrate the segmentary fragments Nos. 500.7, 500.8, 
500.20, 500.26, and 500.52, several of which probably represent the 
same trunk. 
CycapELLa Knownrontana Ward. 
Pl. LXX, Figs. 1-3; Pls. XCI-XCV. 
1900. Cycadella Knowltoniana Ward: Proc. Wash. Acad. Sci., Vol. I, p. 267, pls. 
XV1l1I-xXx. 
Trunks medium size (25 cm. in diameter), cylindrical, bearing a few 
small secondary axes; rock soft, light colored without, dark and varie- 
gated within; organs of the armor horizontal; leaf scars subrhombic, 
8 to 12 mm. wide, 4 to 6 mm. high; leaf bases relatively dark, punc- 
tate with minute white-walled tubes; walls thick, sometimes 5 mm., 
soft, white on their outer edges, brown within as shown on the frac- 
tures, contrasting strongly with the nearly black leaf bases, the 
ramentaceous hairs very distinct, showing their mode of origin in the 
petioles and their passage from the armor into the outer coating which 
they form, to a thickness in places of nearly 2 cm.; reproductive 
organs few but distinct, usually raised, 16 by 25 mm. in diameter, sur- 
rounded by two or more rows of narrow involucral bract scars, the 
bracts distinctly traceable in longitudinal section to their origin in the 
receptacle, from which also proceed the essential organs in an advanced 
stage of decay and mineralization; armor 3 to 4 cm. thick, joined to 
the axis by a very irregular but somewhat definite line, the petioles 
emerging from different depths as projections of the wood substance; 
