THE MARYLAND CYCADS. 449 



exposed along both sides and for 10 cm. at the lower end. This makes it 

 possible to look along the junction and see just how the medullary rays 

 pass into the outer parts. Thin longitudinal ridges or lamellae varying 

 from 1 cm. to 3 cm. in length rise from the surface of the medulla and 

 penetrate the woody zone. These ridges are not exactly parallel, but 

 are slightly' oblique, so that their ends pass one another, giving the general 

 surface a somewhat reticulate appearance. They are coarser and sharper 

 than those represented in Saporta's figure of Cycadeoniyelon hettangensis 

 Sap. (PL Jur., pi. cxix, fig. 5). The portion of Bucklandia Milleri Carr, 

 (loc. cit., pi. Iv., fig. 1), from which the outer parts are removed, approach 

 it more closely, but the nearest figure to it known to me is that of Omphal- 

 omela scabra Germar (Palaeontographica, Vol. I, pi. iii). The bundles 

 can also be seen passing out very obliquely and becoming nearly vertical 

 at the summit. They are chiefly represented by large cylindrical tubes. 

 (Locality: PL LXXX, near No. 106.) 



PL XCVII, Fig. 2 shows the Cronmiller fragment, W. C, B., No. 1485. 

 This is a piece of the ai^mor, only 26 cm. long, of one edge of a very much 

 laterally compressed trunk, and may be compared with similar parts of 

 W. C, B., No. 1470, as Mr. Bibbins has done. It would seem to have 

 undergone some compression after the axis had disappeared, as it is 

 narrower next the axis than farther out. (Locality : PL LXXX, No. 69a.) 



PL XCVII, Fig. 3 is the best view made of the Griffith trunk, W. C., 

 B., No. 1467, already described, prior to sectioning, and shows one side 

 and the summit with its terminal bud. 



PL XCVII, Fig. 4 is an interior view of the Magruder fragment, 

 W. C, B., No. 1489, of which the outer surface is represented on PL 

 LXXXVII, Fig. V, 11. This is a segment from the outer portion of a 

 small trunk extending less than halfway round, so preserved that a cross 

 section would be crescent shaped. It extends to the extreme base, and 

 the central portion, which is higher than the rest, probably reaches nearly 

 to the summit. It is of a light-reddish color, soft sandy consistency, 

 and low specific gravity. The maximum height is 17 cm., which is 

 reduced to 9 cm. at both ends of the segment. The diameter of the 

 trunk, which seems to have been nearly cylindrical, was 21 cm. The 

 partial girth is 40 cm. The diameter of the hollow interior is 11 cm. 

 The radial thickness of this segment varies from 6 cm. to 8 cm. The 



MON XLVIII — 05 29 



