waRD.] JURASSIC CYCADS FROM WYOMING. 401 
Pls. XCVIII and XCIX represent the two opposite broadest sides 
of the specimen No. 500.5; Pls. C and CI afford side views of the fine 
branching trunk No. 500.38, and Pl. CII shows the interior from the 
fractured side; Pl. CIII shows the outer surface and Pl. CIV the inner 
fractured surface of No. 500.30; Pl. CV presents the best-preserved 
side of the trunk No. 500.36 with its broken summit, and Pl. CVI 
includes the broken base and a portion of the other side. Views of 
the two sides of the combined Nos. 500.49 and 500.77 are given in Pls. 
CVI and CVIIL, and the internal structure of No. 500.49, as revealed 
by the transverse fracture, is shown in Pl. CIX. The nearly com- 
plete small trunk made up of Nos. 500.78 and 500.82 is well shown 
on Pl. CX, in which a is the former and 0 the latter of these speci- 
mens. Pl. CXI represents the specimen No. 500.70, which is believed 
to be the apex of that trunk extending over portions that are lost in 
the lower pieces. Fig. 1 is a view from the top showing the rounded 
summit, and Fig. 2 a view from below showing the concave, partially 
decayed fracture, corresponding very closely with the upper portion 
of No. 500.82 as seen in Pl. CX at d. The anomalous specimen, No. 
500.23, is shown on PI. CXII, Fig. 1 being a view of the left top and 
Fig. 2 a view of one side. 
CYCADELLA NoDosa Ward. 
Pls. CXTII-CX XI. 
1900. Cycadella nodosa Ward: Proc. Wash. Acad. 8ci., Vol. I, p. 271. 
Trunks small, 8 to 14 cm. high, 10 to 20 cm. in diameter, ellipsoidal 
or conical, somewhat laterally compressed or otherwise distorted, cov- 
ered with small secondary axes forming prominences or protuberances 
and giving the specimens a knotty or gnarly appearance; rock hard, 
light ash colored or brown on weathered surfaces, black within, of 
medium specific gravity; organs of the armor generally horizontal; 
leaf scars subrhombic, 15 to 20 mm. wide, 5 to10 mm. high; leaf bases. 
punctate with small white tubes; walls 1 to 3 mm. thick, firm, light. 
colored, striate, sometimes with a median groove or line; reproductive 
organs few, obscure, simulating the secondary axes, surrounded by 
large subrhombic involucral bract scars in several rows passing into: 
leaf scars, central portion solid, heterogeneous; armor 2 to 4 cm. thick, 
joined to the axis by a definite line; wood 2 to 4 cm. thick; cortical 
parenchyma 1 cm. thick; fibrous zone1 to 3 cm. thick, consisting of two 
or three rings, the outer one showing radiate structure; medulla either 
circular and 4 cm. in diameter or elliptical in cross section, the lesser 
diameter 2 to 4 cm. and the greater 3 to 8 cm. 
After considerable hesitation 1 have decided to group together seven 
of the specimens under this name, although from different states of 
20 GEOL, PT 2——26 
