IIIK MAUVLAM) CVCADS. 425 



(lark pai'ts. Its specific gravity is ahout that of the average cycad. 

 The trunk is 1(1 cm. high, 25 cm. in its major and 17 cm. in its minor 

 diameter, and it has a giith of 71 cm. (Locality: PI. L.WX, No. 132.) 



PI. LXXXVIl, Fig. m, 4 represents part of one side of tlie Crook 

 fragment, Xo. I. W. ('., B., Xo. 1428. This is a segment of the basal 

 portion of a smallisii trunk, divided somewhat evenly by a plane pas.s- 

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

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

 passes tlu'ough at an angle of about 40° to the major axis of the ellipse. 

 The fracture across the up[)er end is also nearly (>ven and horizontal, 

 presenting a cross section of the tiimk, while that thi'ough the (-enter 

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

 sion in the center, l)ut these irregidarities are not due to fracture nor 

 to decay in the process of silicification. This latter process has pi'o- 

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

 chalcedony, especially in the interior poi'tion. The rock is therefore 

 firm and heavy. The color is a dark gra>-, 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 SO cm. (Locality: PL LXXX, No. 53.) 



PI. LXXXVII, Fig. IV, 4 is a side view of the R. P. Disney trvmk. 

 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 textiu'e, 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 doubtfidly referred to 

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

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



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

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

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

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



