64 PP. REPORT OF PROGRESS. FONTAINE & WniTE. 



Tlie crenulated pinnules are quite long, being usually 2 

 centimetres in length. Fig. 2 shows the pinnules with 

 crenulate margins, and Fig. 3, those with more pronounced 

 lobes. The lower basal pinnules of the normal forms show 

 a tendency to heteromorphism, in being elongated and de- 

 pressed along the rachis to which its pinnae is attached. 

 We would call attention to the difference in the facies of 

 Brongniart's plant from that of G-ermar. Our specimens 

 show all the forms figured by Germar, almost mfac-simlle. 



It is worthy of note that we find the same form of fruit- 

 ing pinnules with those given by Germar, only the impres- 

 sions of the sori are larger. They seemed to be formed by 

 inllations of the ends of the lateral nerves, and often occupy 

 the entire space between these nerves. Fig. 1 represents 

 a fruiting pinna, and la an enlarged portion of the same. 

 The crenulate and lobed forms are very rare. 



Pecopterls ellipUca, Bunb. PI. XVII, Fig. 1. 



Several specimens of this rare and well characterized 

 species Avere found in the roof-shales of the Waynesburg 

 Coal at Cassville, Monongalia Co., but they are very rare 

 here, and we have found the plant nowhere else. Bunbury 

 found at Frostburg, Maryland, a few fragments of a plant 

 which seems identical with ours. He gives figures of it in 

 "The Quar. Jour, of the Geol. Soc," Vol. II, 1845, under 

 the name Pecopteris elliptica. Our specimens are much 

 larger, and show the details and facies better, as figured on 

 Plate XVII, Fig. 1 and la. Schimper is in error when he 

 states that "the lateral nerves of the pinnules diverge 

 strongly after forking," for in Bunbury' s plant, as in ours, 

 the divergence is quite slow. The plant seems to have had 

 a very robust, rigid aspect, and thick leathery pinnules. 



The strata for a considerable distance above the Pitts- 

 burg coal are exposed at Frostburg, and it is quite probable 

 that the plant occurs there at the same horizon as at Cass- 

 ville. 



Pecopteris Oreopteridia, {Scldoih.), Brongt, 



In the Upper Barren Shales, at Bellton in Marshall Co., 



