= iy = 
be represented by abundant bactcrioides, appear to have attacked the 
cell membranes in many cases where the cell thickening is but little 
corroded. As will be observed in the transverse section, Fig. 1, 
there is no trace ofannual rings. This is the more interesting as 
well as important since the horizon of the specimen falls so near that 
ofthe coils and their associated fossil leaves as to render it highly 
probable that (he climatic conditions were not greally changed during 
the perisd bebween the deposition of the coal and the burial of the fossil 
tree. 
In the material sectioned I have not been able to disvover any 
resin cells or vessels hat appear to be secretory. Neither is there any 
evidence of branching of the stem tobe seen on the fragment. The 
variation in transverse diameter of the ray cells, asshown in a tan- 
gential section, Fig. 3, is largely due to the fact thatoa portion of 
them arecut near the narrrowed ends. 
Dadoxryion meridondale is distinguished from the oriental species 
associated with the Ganyamopreris flora by the absence of annual rings, 
and by the arrangement of the areolesin a single row. The latter 
character, as well asthe differance in the medullary rays with their 
more nearly round ray cells, readily differentiate the species from 
Dado vylon nununulaurium, in which, moreover, the pores are round. 
Locality : Butia, Rio Grande do Sul. Horizon 30-60 meters above 
the S. Jeronymo coal. Lot 3916. The ty peis BR 20. 
Undetermined Gymnospermous Woods 
In addition to the specimens described above I have examined 
several other. woods which are either too poorly preserved for satis- 
factory determination, or they are identical with other species already 
treated. The specimens sectioned come from seven different localities. 
In every case the examination of the slides is difficult on account 
of the amorphous silicification withoul contrast of color such as is 
afforded by infiltrations of oxides of iron or manganese, humic, or 
bituminous solutions, etc. It is probable that in some, al least, of 
these examples there was replacement ofthe cell walls or contents. 
The results of bacterial activity are splendidly illustrated in many 
of the woods, anda few of the slides afford fine exhibitions of bacte- 
rioids. Frequently spheroliths are developed in the partially disor- 
ganized lissue. 
5500 63 
