rilK MARYLAND C'VCADS. 461 



see it in its natural position it is neoossary to place the right side of the 

 plate (lownwai'd. This is a short piece of the base of a trunk of unknown 

 height, much flattened longitudinally and laterally, so as to form a narrow, 

 elongated ol)ject. The axis is largely decayed, so as to leave a cavity 

 at each i'\u\. It is more even across the base Ihaii aci'oss the summit. 

 The material is fine grained, as if argillaceous, of a light-slate color 

 except superficial I'ust-colored patches, and not hai-d or heavy. The 

 maximum height is 11 cm. and the minimum about 8 cm. It is 34 cm. 

 in longer diameter and only 13 cm. in shorter diameter. The girth is 

 76 cm. (Locality: PI. LXXX, near Xo. 74.) 



PL LXXXVII, Fig. II, 2 is a fairly good view of the Linthicum frag- 

 ment, W. C, B., Xo. 1484. It is a segment of a large trunk, in-oken trans- 

 versely at both ends and radially on both sides, showing the outer surface 

 about one-third of the wa>- round, extending inward to the inner wall of 

 the woody zone, which presents a concave surface corresponding to the 

 convex outer one. The fracture at the lower end is very irregular, a 

 sharp central portion projecting 9 cm. below the adjacent parts. The 

 upper fracture is more even, but is also raised in the middle. The radial 

 fractures are very regular and follow the leaf scars, thus rapidly converg- 

 ing. The specimen is thoroughly silicified, and a thin film on the outside 

 of most of the broken surfaces has turned yellowish white and is covered 

 with fine crystals (druse). The external surface is dark, the rest light 

 and >'ellowish. The specific gravity is high. The maximum height is 

 29 cm. and the minimum 18 cm. The circumferential width (measured 

 on the arc) is 35 cm. The corresponding measurement across the concave 

 interior (measured on the arc) is 14 cm. The last two dimensions, taken 

 on the chord instead of the arc, are, respectively, 24 cm. and 12 cm. The 

 radial thickness is about 12 cm. and nearly iniiform. The leaf scars 

 are very large, averaging 16 mm. high and 28 mm. wide. (Locality: 

 PI. LXXX, Xo. 62c.) 



PI. LXXXVII, Fig. II, 4 is a view of the Dorsey trunk. W. C, B., 

 Xo. 6353. It is a very large fragment, probably representing a third 

 of the trimk, very irregularly broken. One side seems to reach near 

 the summit, where there is a depression which may represent a crow's 

 nest. The lower part is wholly wanting from a vei'>' iri'egulai- diagonal 

 fi-acture. The interior seems to have been hollow. The surface is 



