DESCRIPTION OF SPECIES. PP. 79 



Habitat. — Roof shales of the Waynesburg Coal, Cassville, 

 West Virginia, and Carmichiael' s, Pennsylvania, 



Pecopteris omkles. Sp. no v., PI. XXIX, Fig. 3. 



(Frond, tripinnate; primary pinnse, tapering rapidly to 

 the summit ; secondary pinnse, alternate, placed thickly, 

 and going off from the primary rachis at an acute angle ; 

 pinnules, ovate, united at the base ; mid-nerve, strong ; lat- 

 eral nerves, making very acute angle with the mid-nerve, 

 forming 6 or 7 pairs only, simple.) 



Habitat. — Chocolate shales, 400 feet above the Wavnes- 

 burg Coal, Bellton, Marshall county. West Virginia. 



Pecopteris lanceolata. Sp. nov. PI. XXIX, Figures 7, 8 

 and 9, 



(Frond, tripinnate ; secondary pinnse, alternate, some- 

 what crowded ; pinnules, lanceolate, united for some dis- 

 tance, and curving slightly forwards ; mid-nerve distinct ; 

 lateral nerves few in number, going off almost at a right 

 angle, simple.) 



This beautiful little plant has some resemblance to Pe- 

 copteris Unita, Brongt., but the pinnules are more delicate 

 than those in that species, and have a characteristic for- 

 ward inclination not seen in P. unita. 



Habitat. — A shale at Bellton, 400 feet above the Waynes- 

 burg Coal; and at Moundsville, West Virginia, at the ho- 

 rizon of the Waynesburg Coal. 



Pecopteris latifolia. Sp. nov., PL XXIX, Figs. 5-6. 



(Frond, tripinnate; principal rachis strong; secondary 

 pinnse very closely set, alternate ; secondary rachis very 

 stout ; pinnules united at the base, broad, bluntly ovate ; 

 mid-nerve well marked ; lateral nerves going off at an acute 

 angle, and once forking near the insertion.) 



This plant has a large vertical range, as we find it at Cass- 

 ville, in the roof shales of the Waynesburg Coal, and also 

 at Bellton, West Virginia, 400 feet above the Cassville ho- 

 rizon. 



