DESCRIPTIOTs^ OF SPECIES. PP. 6i") 



400 feet above the Waynesburg coal, we find a I'orm of Pe- 

 copteris which we identify with the above species. It has 

 precisely the character of the plant figured by Goeppert 

 in his Foss. Flor. d. Perm. Form. Plate X, as Sphenopteris 

 integra. The nervation agrees exactly with Brongniart's 

 P. oreopteridia. We have not seen this plant at any lower 

 horizon. 



Pecopteris pennaformis, Brongt. ; Var. latifolia. PI. 

 XYII, Figs. 4 and 5. 



None of the typical forms of P. pennseformis have been 

 seen in the upper measures of W. Va., but at Cassville we 

 find with the Waynesburg coal a form which we consider 

 a variety of this plant, and which we describe as Var. lati- 

 folia. 



The pinnules of our variety are broader in proportion to 

 their length than those of Brongniart's plant, and the nerv- 

 ation is somewhat different, as the lateral nerves make a 

 greater angle with the mid-rib, in the pinnules. The facies 

 is much like Heer's P. penneeformis, as figured in his Flor. 

 Foss. Hel. 



Pecopteris Miltoni, Artis, PL XXIII, Figs. 2 and 8. 



On plate XXIII, Figs. 2 and 3, we give a form of this 

 species which differs somewhat from all hitherto figured. 

 It seems much more slender and narrow than the typical 

 form. The mode of passing from entire pinnules, at the 

 end of a compound pinna, through crenulate forms, into 

 lobed ones, and finally into simple pinnules, is very gradual, 

 and produces often very slender, elongate pinnae and pin- 

 nules. Still this plant is so closely connected by transi- 

 tion forms with the typical one, that it cannot be separated 

 even as a variety. 



At Carmichael's, Penn., where this form occurs, we find 

 immense numbers of this plant, which seems to exclude al- 

 most all other forms at this place. At West Union, in W. 

 Va. also the plant is very common. The pinnae often ex- 

 hibit a spread of 2 and 3 feet, and fragments in great num- 

 5 PP. 



