DESCRIPTION OF SPECIES. PP. 51 



toward the summit of the pinna, tlie broad rachis widens 

 ont into a heteromorphous terminal j)innule, which is 

 usually somewhat falcate, and slightly eared at base, or 

 lobed occasionally, by consolidation with the adjoining 

 small pinnules of the terminal part of the pinna ; the 

 upper pinnules tend to unite and pass into lobes, by grow- 

 ing smaller and being attached by their whole base ; mid- 

 nerves distinct to about one-quarter the length of the pin- 

 ule, and formed of three principal nerves consolidated to- 

 gether ; these three principal nerves split up and repeat- 

 edly branch, until they fill the entire pinnule ; at their 

 lower portion, by consolidation, they form a broad, flat, 

 strap-shaped bundle of nerves, which in their insertion 

 occupy a considerable portion of the base of the pinnule ; 

 in the upper pinnules, the nerves go off from the entire base, 

 as in Odontopteris ; they are tolerably strong, and are very 

 distinct.) 



This plant has a facies much like Odontopteris Du- 

 fresnoyii (Brongt.) Schimp., in nervation, and modes of 

 attachment of the pinnules. From the great size of the 

 rachis and other points it would seem to be simply pinnate, 

 and apparently to belong to Schimper's sub-genus Neu- 

 ropteridmm, which contains plants belonging to the Trias. 



Habitat— Roof-shales of the Waynesburg Coal, Cassvilie 

 and West Union, W. Va. 



Neuropteris Jlmbriata, Lesqx. 



In the roof-shales of the Waynesburg Coal, at Carmi- 

 chael's, Penn., we find very fine specimens of this plant 

 2 inches long and as many wide. It occurs there associated 

 with Neuropteris flexuosa. 



Neuropteris species ? PI. X, Fig. 11. 



This huge leaflet was found associated with abundant re- 

 inains of N. flexuosa near JoUeytown, Greene Co. Penn. 

 400 feet above the Waynesburg Coal. It is probably a ra- 

 chial leaflet of N. flexuosa. 



Neuropteris cordata., Brongt, 



This plant, as limited by Schimper, is quite common in 



