THE MARYLAND CYCADS. 443 



tures is about 9 cm. One of these is oblique and shows over 10 cm. 

 The greatest arc of the circumference is 25 cm. The specimen is also 

 very convex vertically, and this arc measures 26 cm. 



The leaf scars of C. Fontainemia are always very irregular, and 

 this specimen presents the anomaly of having the sharper vertical angle 

 as often above as below. This at first made it doubtful what was the 

 true position of the trunk. But the vascular strands, clearly seen on 

 both the radial fractures, is conclusive as to the true position. These 

 strands rise at a sharp angle from the fibrous zone, pass at a much wider 

 angle nearly straight through the cortical parenchyma, and then curve 

 gracefully outward into the leaf bases, sometimes bending somewhat 

 downward where these are slightly descending. The inner wall of the 

 wood, which was in contact with the medulla, shows over a concave 

 area of 10 cm. by 14 cm. alternating rows of elliptical scars, 5 mm. by 

 15 mm. in diameter, of the medullary rays, the upward inclination of 

 which is distinct. " 



PL LXXXVII, Fig. I, 1 is an end and top view of the Turner trunk, 

 W. C, B., No. 3046, more fully shown on other plates. 



PL LXXXVII, Fig. Ill, 2, is a side and top view of the Griffith 

 trunk, W. C, B., No. 1467, another principal type of the species. The 

 terminal bud can be seen in this view, but the specimen had been sec- 

 tioned through the center of the bud before this group was photographed. 



PL LXXXVII, Fig. in, 6, shows the Noah Donaldson trunk, W. C, 

 B., No. 1470, but not to good advantage. 



PL LXXXVII, Fig. Ill, 8, is a very good side view of the Riddle 

 fragment, W. C, B., No. 1488. This specimen probably contains 

 three-quarters of the entire trunk. It seems to extend from at or very 

 near the true base to within a very short distance of the summit. It 

 is flattened laterally to a thin slab, and a piece of considerable size is 

 broken away along an even vertical plane from one of the edges. A 

 large irregular piece has also disappeared from one side, reaching inward 

 to the middle and extending from the top downward to below the middle 

 on one edge but much less on the other. It is of a light-drab or fawn 

 color, with rust stains at some places, firmly silicified and moderately 

 hard and heavy. It is 24 cm. high and has a maximum width of 26 

 cm. The missing piece added to this would probably give a width 



