452 MESOZOIC FLORAS OF UNITED STATES. 



Views of both the specimens appear in the different groups and show 

 their relative size and character, and the type is shown in Pi. XCIX. 



PI. LXXXVII, Fig. I, 3 represents the same side of the Wilson 

 trunk, W. C, B., No. 1479, that is shown in PI. XCIX, but here the 

 specimen is more inclined from the camera, so that the apical cavity is 

 not seen. The equatorial zone is very distinct. 



PI. LXXXIX, Fig. I, 3 gives an excellent view of the base and a 

 portion of the external surface of the Dearstine trunk, M. G. S.-W. C, 

 B., Xo. 9049. This is part of the base of a very large trunk, probably 

 larger than W. C, B., No. 1479, but as that specimen was decayed at 

 the base, this one supplies that deficiency. It has the same light-colored 

 sandy character, and the specific characters all agree. This specimen 

 is very unequall}^ and obliquely broken across near the base, so that 

 "while one side actuall}^ reaches the base the other rises 20 cm. above it, 

 but the rapid rounding off 'on that side indicates that the trunk was 

 either much inclined or else greatly compressed vertically. There is 

 little lateral compression and the diameter either way is about 36 cm. 

 It weighs 17.24 kg. (Locality: PL LXXX, No. 103.) 



PL XCIX shows the perfect side and the apex, with its depression, 

 of the original type or Wilson trunk, W. C, B., No. 1479. 



This is perhaps the most interesting of all the Maryland cycads, 

 not only because its precise stratigraphical position is so well known, 

 but also from its large size, its completeness, and the number of fea- 

 tures it presents that are not possessed by any other specimen. It is 

 unbranched and somewhat elliptical in cross section. The longer diam- 

 eter is 47 cm. and the shorter 25 cm., measured at about the middle 

 part. It does not vary greatly until near the summit, whei'e it is quite 

 rapidly contracted. Its maximum girth is 122 cm.; that near the top 

 is 110 cm. It is obliquely truncated at the summit, but no great por- 

 tion is wanting. The longer side shows a height of 47 cm. and the 

 shorter of 35 cm. The fracture across the top is sunk in the middle 

 and the average measurement does not exceed 39 cm. One side is 

 complete except the loss of a small piece at the summit. The other 

 side has lost a large irregular portion at the base, making an opening 

 into the hollow interior 27 cm. high and varying in width from 10 cm. 

 to 23 cm. A small piece was purposely broken out of this opening 



