TIIK MAKVLAM) CYCADS. 437 



the axis \W other slopmg outward fr<.,n above. The rock is of a dark- 

 asli rolor, liijhK-r within. It is rather hard and lieavy and c,uite (•.•m.^aet. 

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

 maxhnurn thickness is e.n. (Loeahty: PL LXXX, near iNo. 80.) 



PI LXXXVII, Fig. V, li), is a side view of the ^^ . 1'. Disney traf>ment, 

 W (' b' No 3349. whicl' is so much worn that it is .hfficuh to make 

 out its relations. It is eertahily .-ycadean and belonj^s mostly to the 

 ,nnor It is irregularlv circular in shape, 11 cm. to 13 cm. m diameter 

 and 5 cm to 6 cm. thick. The inu(>r surface is spongy and probat)ly 

 re.u-hes some distance into the wood. The edges show the leaf bases 

 and spadices. Faint scars of the petioles are visible on th(> worn mtern.r 

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

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



PI LXXXVII, V\g. V, 20, represents the ^\hlte fragm(>nt, W . ( ., 

 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^ 

 doul)tless originally very low and squat . It extends from base to summit, 

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

 fornuMri)V two irregularly vertical fracture planes somewhat as a cake is 

 cut The outer parts are dark ])rown, 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 U cm. Measured tangentially it is 8 cm., 

 while its vertical thickness is 10 cm. (Locality: PI. LXXX, No. /I.) 



PI LXXXIX Fig. II, 1, shows the thin outer edge of the Iv. i. 

 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) l)y 

 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 

 wills are rather too thick for C. McGceana and it is very probable that 

 if the entire trunk had l^een found it would have proved t<. be a new 

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



PI LXXXIX, Lig. 11, 8, representing the R. T. Donaldson fragment, 

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



