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-hke impressions arranged in quincunx; stem 

 two inches and a quarter in diameter. 



Observations. — Found 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.) 



Fi£. 5. 



SiGiLLARiA Marineria. Specific Character and Description. 

 Stem channeled ; impressions in form of disks, arranged in quin- 



