216 riiOCEEDINGS OF THE NATIONAL MUSEUM. 



lueclullary rays, the scars consisting of conspicuous elongated depres- 

 sions arranged in longitudinal rows at equal distances (1 cm.) from one 

 another; the scars nearly the same distance one above another but 

 alternating so as to form diagonal rows crossing the vertical ones at an 

 angle of nearly 4r)0; inner face of the second ring of wood (exposed 

 over a small area in one specimen) nearly smooth but faintly striate in 

 a horizontal direction, marked witli smaller, more distant scars; 

 medulla (represented only in one small disk-shai)ed specimen from near 

 the top of a trunk, and here thoroughly crystallized) scarcely known. 

 Four of the fragments picked u]) by me belong to this species. They 

 are Nos. 11, ll*, 17, and 18. No. 11 is a large block weighing over 7 

 kg., showing considerable of the external surface, which is not very 

 clear. Portions of it have been detached and cut in several directions 

 to show the internal structure. Most of such characters above given 

 are derived from this source. No. 12 is a very small piece, consisting 

 entirely of the fibrous zone of wood, of which it shows the inner wall 

 with the scars identical in charactei" with those of No. 11, of which it is 

 probably only a detached fragment. No. 17 is a crescent-shaped frag- 

 ment from a small trunk and weighs 2.27 kg. It appears to have come 

 from near the top of the trunk. No. 18 is a thin, horizontal zone or 

 disk from near the top of a small trunk. The internal portion is much 

 crystallized. 



CYCADEOIDEA JENNEYANA Ward. 



1891. Cjicadeoidca jcntutjand Waki>, I'roc. IJiol. Soc, WashLugton, April 9, 1894, IX, 



p. 87. 



Trunks large and tall, attaining a height of 130 cm., cylindrical, 

 little compressed, .'H) to 50 cm. in diameter, the girth reaching over a 

 meter and a half, tirmly silicitied, more or less chalcedouized or opalized 

 within, very hard and heavy, light brown or reddish externally, white 

 or reddish, sometirties black within; organs of the armor horizontal 

 except near the summit; leaf scars arranged in intersecting si)iral 

 rows, those passing from left to right making an angle of about 40° 

 and those from right to left of about 50° with the vertical axis; scars 

 subrhombic to subtriangular with mostly rounded angles, sometimes 

 kite-shaped, large, 20 to 30 mm. wide, 12 to 25 mm. high, partially or 

 wholly filled with the remains of the leafstalks; vascular bundles in 

 the petioles arranged in an imperfect row all round near the margin 

 with other straight rows, or somewhat scattered in the interior, 

 numerous (forty were counted in one cross section), circular, elliptical, 

 crescent-shai^ed, or kidney-shaped in section; ramentaceous inter- 

 spaces very thick but somewhat variable (0 to 13 mm.), sometimes 

 roughened or irregularly affected by small pits representing bract 

 scars, a line of which may run through the center dividing the walls, 

 or by cracks which divide them into plates or small partitions; repro- 

 ductive organs numerous, large, and well developed, often protruding, 

 sometimes cavitons, S(iattered over all parts of the surface, axillary to 



