THE MARYLAND CYCADS. 437 



the axis, the other sloping outward from above. The rock is of a dark- 

 ash color, lighter within. It is rather hard and heavy and quite compact. 

 The length (height) is 16 cm. and the width about 15 cm., while the 

 maximum thickness is 6 cm. (Locahty: PL LXXX, near No. 80.) 



PL LXXXVII, Fig. V, 19, is a side view of the W. P. Disney fragment, 

 W. C, B., No. 3349, which is so much worn that it is difficult to make 

 out its relations. It is certainly cycadean and belongs mostly to the 

 armor. It is irregularly circular in shape, 11 cm. to 13 cm. in diameter 

 and 5 cm. to 6 cm. thick. The inner surface is spong}^ and probably 

 reaches some distance into the wood. The edges show the leaf bases 

 and spadices. Faint scars of the petioles are visible on the worn interior. 

 Those of the flowering axes are much more distinct and exhibit the usual 

 characters. (Locality: PL LXXX, near No. 50.) 



PL LXXXVII, Fig. V, 20, represents the White fragment, W. C, 

 B., No. 3068. It consists of a small piece, probably from from a nearly 

 circular trunk of moderate size that was much vertically compressed, but 

 doubtless originally very low and squat. It extends from base to summit, 

 but only represents one side, being an imperfectly wedge-shaped segment 

 formed by two irregularly vertical fracture planes somewhat as a cake is 

 cut. The outer parts are dark brown, while the inner ones are light 

 colored, reddish-white with bright streaks of white. The substance is 

 light and porous or soft sandy and more or less friable, but in places it 

 becomes hard and partially opahzed. Its longest measurement, which 

 is in a transverse direction, is 14 cm. Measured tangentially it is 8 cm., 

 while its vertical thickness is 10 cm. (Locality: PL LXXX, No. 71.) 



PL LXXXIX, Fig. II, 1, shows the thin outer edge of the R. T. 

 Donaldson fragment, No. 9, M. G. S.-W. C, B., No. 9047, which consists 

 of a thin wedge from the side of a trunk, penetrating from the surface to 

 the center of the medulla. It has a surface of only 4 cm. (vertical) by 

 13 cm. (arc), but over this surface the leaf scars are beautifully shown, 

 and they are the smallest thus far observed, being only 10 mm. to 15 

 mm. wide by 4 mm. to 7 mm. high and very regularly arranged. The 

 walls are rather too thick for C. McGeeana and it is very probable that 

 if the entire trunk had been found it would have proved to be a new 

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



PL LXXXIX, Fig. II, 8, representing the R. T. Donaldson fragment, 

 No. 13, M. G. S.-W. C, B., No. 9057, is a flat, vertically compressed frag- 



