THE MARYLAND CYCADS. 425 



dark parts. Its specific gravity is about that of the average cycad. 

 The trunk is 16 cm. high, 25 cm. in its major and 17 cm. in its minor 

 diameter, and it has a girth of 71 cm. (Locahty: PI. LXXX, No. 132.) 



PL LXXXVII, Fig. Ill, 4 represents part of one side of the Crook 

 fragment. No. 1, W. C, B., No. 1428. This is a segment of the basal 

 portion of a smallish trunk, divided somewhat evenly by a plane pass- 

 ing vertically a little to one side of the center, preserving the larger 

 half. The specimen is somewhat compressed laterally, and this plane 

 passes through at an angle of about 40° to the major axis of the ellipse. 

 The fracture across the upper end is also nearly even and horizontal, 

 presenting a cross section of the trunk, while that through the center 

 affords a radial section. The base is oblique and indicates a deep depres- 

 sion in the center, but these irregularities are not due to fracture nor 

 to decay in the process of silicification. This latter process has pro- 

 ceeded very far, and there is much crystallization, with a tendency to 

 chalcedony, especially in the interior portion. The rock is therefore 

 firm and heavy. The color is a dark gray, lighter within, and slightly 

 reddish about the base. The maximum height is slightly more than 

 20 cm. This is reduced to 12 cm. on the inner side, owing to the oblique 

 base. The greatest diameter is 24 cm., the distance across the fracture 

 being 23 cm. The half girth is 43 cm., which indicates a total girth of 

 about 80 cm. (Locality: PL LXXX, No. 53.) 



PL LXXXVII, Fig. IV, 4 is a side view of the R. P. Disney trunk. 

 No. 1, W. C, B., No. 6343. It is a large, imperfectly preserved piece 

 of a much flattened trunk, the armor and wood inclosing a slab of 

 medulla 4 cm. thick, which projects 3 cm. farther inward. The trunk 

 is of a dull-gray color and heavy texture, and the large scars are greatly 

 distorted and present a rough, harsh exterior. It probably extends to 

 near the base. The length is 32 cm., the width 21 cm., and the thick- 

 ness 12 cm. This specimen is anomalous, and is doubtfully referred to 

 C. marylandica, its nearest affinities being to W. C, B., Nos. 1481 and 

 3324. (Locahty: PL LXXX, near No. 50.) 



PL LXXXVII, Fig. IV, 5 gives a good view of the best side of the 

 Harwood trunk, W. C, B., No. 3050. This is a portion of a large 

 trunk, much compressed laterally and also vertically, and greatly dis- 

 torted. It shows considerable of the outer surface, including the imme- 



