warp.] JURASSIC CYCADS FROM WYOMING. 409 
supposed to have been related in the perfect trunk, and shows the 
broad side view. Pl. CXLVI is a view of the longitudinal fracture 
of ‘No. 500.51. Pl. CXLVII, Fig. 1, shows the back or thin edge of 
No. 500.74, and Fig. 2 the fracture as has been described above. 
CYcADELLA conrTrRacta. Ward. 
Pls. CXLVIUI-CLII. 
1900. Cycadella contracta Ward: Proc. Wash. Acad. Sci., Vol. I, p. 277. 
Trunks of small or medium size (height not known, 15 to 25 cm. in 
diameter), probably conical above, strongly contracted at the base, 
laterally compressed, more or less branched; rock hard and fine- 
grained, of a nearly uniform drab color or dull reddish on the outer 
surface, of medium specific gravity; organs of the armor ascending 
at their origin, curving outward and becoming horizontal or declined, 
rows of scars (traceable in one specimen) from left to right forming 
an angle of 40° with the axis, those from right to left 55°; leaf scars 
subrhombic, 12 to 20 mm. wide, 6 to 12 mm. high; leaf bases of uni- 
form color, punctate with white tubular pores; walls 1 to 3 mm. thick, 
rather soft, depressed, striate, with a median line or crack; reproduc- 
tive organs imperfectly developed, somewhat raised, 15 by 22 mm. in 
piameter, surrounded by large bract scars passing into leaf scars, 
central portion solid, roughened, warty; armor about 3 cm. thick; 
wood 1 to 8 cm. thick, differentiated in one specimen, the outer zone 
5 mm. thick, the inner 1 em., longitudinally striate; medulla 15 to 30 
mm. in diameter, hard, fine-grained, and homogeneous. 
The specimens constituting this species are Nos. 500.56, 500.57, 
500.58, and 500.79. With the exception of the last their general 
resemblance is obvious, which probably accounts for the contiguity in 
the numbers. No. 500.79 is probably a thin segment from much 
higher on the same trunk as No. 500.56, where the size and shape had 
considerably changed, but the same structure persists. Nos. 500.57 
and 500.58 are portions of the lower end of two different trunks. 
The weights of the several fragments, in the order of the numbers, 
are as follows : 
Kilograms. 
ING: DOOD o:..0 ios ee cae ase se cease ey etn eee 1.13 
No SOO 7 cccenca ed sais ssi ss eee e Ses Site eiecteieiee chiar 1, 25 
No. 500.58 ..--..-------------------- iss selene ee enc aes 1,92 
No. 500.79 22.22. 2 eee ee ee eee ee nee cee eee 0. 76 
The specific name refers to the contracted base. 
Pl. CXLVILL, Figs. 1 and 2, show respectively the outer surface arid 
the longitudinal fracture of No. 500.57. Pl. CXLIX is a side view, 
and Pl.-+CL a view of the longitudinal fracture of No. 500.58. PI. 
CLI is designed to show the relations between Nos. 500.56 and 500.79 
as above mentioned, and Figs. 1 and 2 show what seem to be the same. 
