30 Fossil Plants. 
Description.—Stem arborescent ; length unknown; cylindrical ; 
surface finely striated, longitudinally, and ornamented-with double 
rows of dot-like, linear impressions, divided by obsolete grooves, 
which at intervals of two inches are profoundly widened and deep- 
ened, while the interstitial spaces containing the dot-like impres- 
sions are raised into narrow ridges, giving the stem the appearance 
of being jointed ; dot-like impressions arranged. in quincunx; stem 
two inches and a quarter in diameter. . 
Observations. —F ound in the sandstone rocks at Mariner’s Mills, in 
Trumbull County, Ohio. — It is a fragment of a stem, which from its 
thickness must have been several feet in length. The markings 
on the surface are amongst the most delicate and beautiful I have 
ever seen. In the belief that it will prove to be a new species, it is 
dedicated to my friend Dr. K. (Fig. 5.) 
Siemtaria Mariverta. Specific Character and Description. 
Stem channeled; impressions in form of disks, arranged in quin- 
