450 MESOZOIC FLORAS OF UNITED STATES. 



woody zone, or portion of it here preserved, consisting of one homogeneous 

 ring of a very porous structure, the cortical parenchyma, is nearly 6 cm. 

 thick, as clearly shown at the base. The hollow interior representing 

 the inner wall of this ring of wood is studded with the projecting tips of 

 definite fluted bodies representing the sheaths of the fibro vascular bundles. 

 These are somewhat pointed below, pass upward, and plunge outward 

 into the substance of the wood, broadening as they advance. In some 

 places these maj' be traced nearly 5 cm. The layer into which they pass 

 is of a very spongy consistence. Near the base, where only the ends are 

 exposed, these tubes appear as semilunar, crescent-shaped, or horseshoe- 

 shaped scars, all of which have an .inner curved line in intaglio parallel 

 to the outer contour. 



This small fragment shows most of the characteristics of fossil cycads, 

 and being light and easily transported it was made by Mr. Bibbins to 

 serve an important purpose. He placed it in his carriage when going 

 about the country in search of cycads and showed it to the inhabitants 

 as illustrating what he meant. Often on seeing it a miner or farmer would 

 recognize it as similar to something he had, and this would lead to the 

 discovery of additional specimens. (Locality: PL LXXX, near No. 102.) 



PL XCVII, Fig. 5 shows the interior of the Anderson fragment, 

 W. C, B., No. 6346. It is a small, much-worn fragment, so closely 

 resembling W. C, B., No. 1470 as to suggest that thej^ ma}' be parts of 

 the same trunk. It is 18 cm. long, 12 cm. wide, and 9 cm. thick, but 

 very irregular in shape, showing a little surface with the scars worn 

 down, and large areas over Avhich the erosion has penetrated to the cortical 

 parenchyma, exposing the course of the large leaf strands. Considerable 

 of the medulla remains attached to the upper end. (Locality: PL 

 LXXX, No. 108.) 



PL XCVIII, Figs. 1 and 2 are views of the top and base, respectively, 

 of the R. P. Disney trunk. No. 2, W. C, B., No. 6352. This specimen 

 strongly recalls the type, W. C, B., No. 1467, and has a terminal bud 

 equal to that in its perfection. It shows much better the apical leaves 

 forming the bud. The specimen, however, is smaller, being 17 cm. by 

 23 cm. in diameter, 60 cm.' in girth, and 11 cm. high, including the terminal 

 bud, which is 3 cm. high. The leaf scars are not well shown, being 

 completely massed together by vertical pressure. The base shows the 

 different zones fairly well. (Locality: PL LXXX, No. 59a.) 



