DESCEIl'TION OF TUE SPECIES. 18i) 



Coiitee's. Tlie tVaginents in all respects reseinble the trunks. This would 

 indicate that the difterences seen in the trunks are constant and not merely 

 accidental, and hence have an important meaning'. 



Trunk No. 1. 



Plates CLXXIV to CLX.WIII. 



Tliis trunk is silicified, of an ash-gray color, and is free from ferru- 

 ginous matter. It is oblong-elliptical in shape, with a cross-section 

 roughly elliptical in form, as shown in Pl.CLXXVIII, which gives a photo- 

 graph of its top. The flattening mav be due to compression. From one 

 side near the base a considerable portion has been broken off, Jis is shown 

 in PI. CLXXVI. The maximum height of the trunk, measured on the 

 the ])erfect side, seen in PI. CLXXIV, is 34'^"', and the greatest dimension 

 at base is 30""". Its thickness there is 26"°. The length of the longest 

 dimension at top is It)'''", and the maxinmm width there is 12''" 



At the top a portion is broken away so as to produce a depression 

 slanting downwards, well shown in PI. CLXXVI. This looks a good deal 

 like the scar that would be left by the tearing away of a terminal stem-like 

 appendage. This depression occurs on one side of the summit of the 

 trunk. What was probably the terminal bud of growth is distinct from 

 this, and is seen in the center of the top on PI. CLXXVIII as a rather 

 fiiintly marked depression. On the summit, and to the left of the central 

 ])ud, is another large depression, which appears to correspond to a terminal 

 growth or bud of some kind. Plate CLXXV gives a photograph view of 

 the perfect nai'row side of the trunk in question, giving an idea of its thick- 

 ness. Plate CLXXVII gives a view of the base of the stem, showing the 

 small central medulla surrounded by a comparatively thick woody zone, a 

 vaguely defined cortical layer, and outside of all the very thick mass, com- 

 posed of the bases of the petioles and the material which enveloped them 

 This last portion makes up much the larger part of the trunk. 



On the surface of the trunk, well shown on PI CLXXIV, are several 

 large, daep, irregularly shaped pits, due no doubt to the decay of several 

 adjacent bases of petioles before the silicification took place. 



