46 PP. TIEPOET OF PROGRESS. FONTAINE & WHITE. 



The existence of such well marked types, uniting the 

 features of Sphenopteris and Pecopteris, as was first noticed 

 by Brongniart, would seem to call for their separation into 

 a sub-genus, which as the Sphenopteris facies is that best 

 marked, might be styled Sphenopteris-Pecopterides. 



The plant is named in honor of the eminent palseo-botan- 

 ist, Prof. Leo Lesquereux. 



Habitat — Roof shales of the Waynesburg Coal, West 

 Union, W. Va. 



Sphenopteris pacliynerms, Sp. nov., PI. VII, Figs. 5-Q. 



Frond, bi or tripinnate, pinnae opposite, going off from 

 the main racliis at an angle of about 50°, lanceolate in out- 

 line ; pinnules are alternate, closely set, and incisely lobed, 

 the lobes often toothed ; primary nerve very thick ; lateral 

 nerves, very large, passing into each of the lobes of the 

 pinnules, and usually forking once or twice. 



This plant also resembles the type shown in Pecopteris 

 cristata, Brongt., but is sharply distinguished by the great 

 size of its nerves. The texture of the parenchyma is cori- 

 aceous, and this serves to exaggerate somewhat the nerves. 



Habitat — Roof shales of the Waynesburg Coal, West 

 Union, W. Va. 



SpJienopteris Jiastata, Sj). nov., PI. VII, Fig. 7. 



Frond, bipinnate ; pinn?e, long and linnear ; rachis of 

 pinnse, slender and terete ; pinnules, alternate, lanceolate, 

 with a somewhat hastate base, formed by a sudden con- 

 traction at the insertion of the pinnules ; lobes, on each 

 lamina 4 to 5, with the lobes possessing two or three teeth ; 

 mid-nerve, rather strong ; lateral nerves, rising at an acute 

 angle into each lobe of the pinnule, and forking so as to 

 send a branch into each tooth of the same. 



Habitat — Roof shales of the Waynesburg Coal, Cass- 

 ville, W.Wa. 



Neuropteris, Brongt. 

 The only species of this genus which pass from the lower 

 to the upper beds above the Pittsburg Coal, are those cos- 



