THE MAUYLAM) CVCADS. ' • 449 



exposed along ))oth sides and for 10 cm. at llic lowoi' end. This makes it 

 possil)le to look along the junction and see just how the medullary rays' 

 pass into the outer parts. Thin longitudinal I'idgcs oi' lamelhe varyinj? 

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

 penetrate the woody zone. These ridges ai-e not exactl.y parallel, but 

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

 surface a somewhat I'eticulate appearance. The>' are coai'ser antl sharper 

 than those represented in Saporta's figure of Cycadcomyelon hettangcnKis 

 Sap. (PI. -Tur., 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 Ontpliol- 

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

 can also be seen passing out ver}^ obliquely and Ijecoming nearly vertical 

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

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



PL XCVH, Pig. 2 show^s the Cronmiller fragment, W. C, B., No. 1485. 

 This is a piece of the armor, 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: PI. LXXX, No. 69a.) 



PI. XCVn, Fig. 3 is the best view made of the Grifl:ith trunk, W. C, 

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

 and the siunmit with its terminal l)ud. 



PI. 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 sunnnit. 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 



Mox xr.viii — 0.5 29 



