34 PP. KEPOKT OF PHOGIIESS. FoXTAINE & WHITE. 



one face of the ribs we see the nerve bundle distinctly 

 marked, l)ut the opposite side leaves in the shales only a 

 smooth furrow-like impression, without any sign of nerves. 

 This singular plant might at first sight seem only the im- 

 pression of the stem of a calamite, but its fragmentary 

 character, and the fact that the entire leaf substance is well 

 preserved, with all its carbon intact, and that in this no 

 trace of anything can be seen but the agglutinated rod-like 

 ribs, precludes the idea of its being anything like a Cala- 

 mite. The ribs which compose the entire plant, seem in 

 their original condition to have been cylindrical, but they 

 now ai)j)ear flattened by pressure. Our plant resembles 

 somewhat Goeppert's Bockschia flabellata, "Die Ton. 

 Farnk." PL I, Figs. 1 and 2. 



It seems allied in some respects to Phyllotheca, Brongt. 

 and may stand as a connecting link between that genus 

 and Equisetldes. The sheaths seem to have been stripped 

 oif from the stem which bore them, in laminae, for we often 

 find at the base, near what must have been the insertion, a 

 thinning down of the sheath to a mere film of epidermal 

 matter, as if it had been torn away from the stem which it 

 had embraced. 



Habitat — Roof shales of the Waynesburg Coal, West 

 Union, W. Va. 



Equisetldes striatus, Sp. no v. PI. I, Fig. 5. 



( Stem unknown, sheath seen only in long narrow strips, 

 formed of several consolidated, strongly striated ribs, 

 which terminate in long slender teeth.) 



The ribs show no central vascular cord, or mid-nerve, but 

 are marked with very strong strijie, which resemble nerves. 

 This species is found sparingly, and never attached. 



Habitat— Roof shales of the Waynesburg Coal, West 

 Union, AV. Va. 



Calamite>!, Brongt. 

 This genus, so abundant at the lower horizons of the Car- 

 boniferous Formation, has almost disappeared at the higher 

 levels. We find only one species, and that is very sparingly 



