WARD.] JURASSIC CYCADS FROM WYOMING. 399 
subrhombic, where normal 15 to 20 mm. wide and 8 to 12 mm. high; 
leaf bases soft, rough or porous; walls 1 to 2 mm. thick, soft-sandy or 
decayed and depressed, light colored ‘or yellowish; reproductive 
organs few and obscure, sometimes slightly elevated, elliptical in cross 
section, 12 by 20 mm. in diameter, with or without visible bract scars, 
the central portion obscure; armor very variable in thickness (5 to 25 
mm.), joined to the axis by a definite but more or less irregular line; 
wood 2 cm. thick; cortical parenchyma 1 cm. thick; fibrous zone 1 cm. 
thick, not differentiated; medulla in laterally compressed specimens a 
thin slab 5 mm. thick and 7 cm. long, in vertically compressed 
specimens circular, 2 cm. in diameter. 
This species embraces 6 much-flattened specimens, viz, Nos. 500.4, 
500.18, 500.22, 500.35, 500.68, and 500.69. Of these Nos. 500.4, 
500.18, and 500.35 are nearly complete trunks, No. 500:18 being verti- 
cally or somewhat obliqugly compressed. All the rest are laterally 
compressed. Nos. 500.22, 500.68, and 500.69 may all belong to the 
same trunk, the last two especially resembling each other, but none of 
them are contiguous. They all bear a general resemblance to one or 
other of the species already described, but aside from their great com- 
pression and small size, not specific characters in themselves, there are 
numerous features which forbid their union with any of these. 
The weights are as follows: 
Kilograms,. 
ING S002 3.5 oo eee Scns aa ale hide en AWAD tehdy yh hcne nd Sadie 1.11 
INO SOOO 1B esac raise ep ne pe eect aap ees ak ech Nene Gea ace 1.14 
N0;:000:22' scan scr cceniinee's cede tet wemeusanaes secvsossed 0.79 
N32: 500285 2 hla ts Ae tes oh. wie) eirecects seep uaa eels nia 0. 88 
NO 00068 2 s.2eacdins ss cece aeeens ccm aedeee beet Oseee os teeaeeee 0.59 
ING. OOLO OS eco cpstaceci Lok ates paacyaid dh capes Demy ch dy beeeeh yee! dave 0. 56 
The only specimens that it was thought worth while to illustrate 
are Nos. 500.4 and 500.18. The former is shown on Pl. XCVI. 
The figure gives an exaggerated idea of the specimen, which is flat and 
thin, and only the broad side was taken. Pl. XCVII illustrates No. 
500.18, Fig. 1 showing the upper side which below is a side view, but 
near the top the apex is turned toward the observer and the terminal 
bud may be seen a little on the left. The lack of perspective causes 
its true form to be obscured. 
CYCADELLA JuRAssica Ward. 
Pls. XCVITI-CXII. 
1900. Cycadella jurassica Ward: Proc. Wash. Acad. Sci., Vol. I, p. 270. 
Trunks rather small (10 to 15 em. high, 10 to 20 cm. in diameter), very 
irregular in shape, more or less compressed in various directions and 
distorted, often much branched with several primary axes, sometimes 
with secondary axes only, the branches usually terminating in regular 
