326 Systematic Paleontology 



greater; scars variable in size and shape, chiefly subrhombic to nearly 

 triangular, with curved or fluted sides, inner wall of the tubes marked 

 by a raised line around it; scars averaging 11 mm. in vertical and 23 mm, 

 in lateral measurement ; leaf bases usually absent or only adhering to the 

 bottom of the scars; ramentum walls thick, more or less divided into 

 irregular laminae or scales with fissures between them, their outer edges 

 ragged; reproductive organs numerous, well marked, irregularly scat- 

 tered over the surface, most abundant at the narrower sides, usually 

 cavitous in the centre, sometimes solid and protuding, surrounded by 

 concentrically arranged, crescent-shaped bract scars, sometimes well ex- 

 posed and clearly distinguishable ; armor 3 cm. to 5 cm. thick, separated 

 from the wood by a definite line ; woody zone 4 cm. thick, consisting of 

 an outer parenchymatous ring 3 cm. thick, a thin ring of loose, open 

 structure, and two thin plates separated by another ring of coarse cells 

 divided by radial partitions, the inner walls of both plates marked with 

 scars of the medullary rays, the pattern different in the two cases, the 

 scars on the inner plate 13 mm. long, those on the outer longer and 

 tapering upward ; medulla large, elliptical, tapering upward, of a coarse 

 homogeneous structure. 



Cycadeoidea Uhleri Ward 

 Plate XLVII 



Cycadeoidea Uhleri Ward, 1897, Proc. Biol. Soc, Washington, vol. xi, p. 14. 

 Cycadeoidea UMeri Ward, 1906, Mon. U. S. Geol. Surv., vol. xlviii, 1905, p. 

 454, pi. Ixxxvii, fig. iv, 10; pi. c. 



Description. — ^Trunks small, 28 cm. high, 20 cm. in diameter, 50 cm. 

 to 60 cm. in girth at the thickest part, circular, or only slightly elliptical 

 in cross-section, conical or somewhat cjdindrical-conical in shape, con- 

 tracted at the base, leaf scars definitely arranged in quincunx order and 

 spiral rows around the trunk, one of these sets of rows ascending at an 

 angle of 45° to the axis, the other at a much greater angle; subtriangular, 

 the upper side arched and sometimes slightly grooved, lateral angles acute, 

 inferior angle obtuse or rounded; scars uniform in size, 18mm. wide 

 and 9 mm. high ; ramentum walls 4 mm. to 5 mm. thick, commissure 



