408 OLDER MESOZOIC FLORAS OF UNITED STATES. 
side of No. 500.66, which fits the upper fracture of No. 500.45, and 
Fig. 2 shows the longitudinal fracture of No. 500.40, the lower portion 
of which fits the Jongitudinal fracture of No. 500.45, but between the 
upper portion and the longitudinal fracture of No. 500.66 there is an 
interval of aboutlcm. Pls. CKLIII and CXLIV represent, respec- 
tively, the outer and inner surfaces presented by the united comple- 
mentary fragments Nos. 500.50 (a) and 500.60 (4). 
CYCADELLA FURRUGINEA Ward. 
Pls. CKLV-CXLVII. 
1900. Cycadella furruginea Ward: Proc. Wash. Acad. Sci., Vol. I, p. 276. 
Trunk small (18 em. high, 9 by 22 cm. in diameter), ovoid, laterally 
compressed, unbranched; rock hard, rust-colored without, striped and 
spotted with the same in the interior, of medium specific. gravity; 
organs of the armor horizontal at the middle, descending below, and 
erect at the summit; leaf scars subelliptical, 10 mm. wide, 5 mm. high; 
leaf bases fine-grained, not porous nor punctate; walls 2 to 3 mm. thick, 
soft, rust-colored, with a median groove; reproductive organs much 
obscured, sometimes raised, elliptical, 15 by 20 mm. in diamieter, sur- 
rounded by thin, obscure, involucral bract scars, the central portion 
clearly shown only on the fractured surfaces, heterogeneous and much 
altered by mineralization; armor 2 to 3 cm. thick, irregularly joined to 
the axis; wood 1 em. thick; cortical parenchyma 5 mm. thick; fibrous 
zone 5 mm. thick, not clearly differentiated into rings, but longitu- 
dinally striate, parallel to the axis of the trunk; medulla a thin slab 
visible only on the narrow edge, where it is 1 cm. thick, apparently 
4 to 5 cm. wide. 
This species includes the two fragments Nos. 500.51 and 500.74, 
exactly alike in all their characters and certainly belonging to the same 
trunk. The fracture in both cases is longitudinal in the direction of 
the minor axis, starting in obliquely near the top and becoming ver- 
tical near the middle. In No. 500.51 this vertical direction continues 
to near the base, and then runs out on the same side it went in. In No. 
500.74 it describes a sort of curve, cutting in to near the center and 
out again at a still sharper angle long before it reaches the base. The 
true base and summit are therefore lost in both specimens. There is 
one point at which the two pieces probably are actually contiguous, 
though the surface of contact is not large enough to demonstrate this. 
No. 500.51 weighs 1.36, and’ No. 500.74, 0.81 kilograms; total, 2.17 
kilograms. 
Named from the ferruginous or rusty color peculiar to these speci- 
mens. 
Pl. CXLV represents the two specimens side by side as they are 
