52 PP. REPOllT OF PROGRESS. FONTAINE 6i WHITE. 



the roof shales of the Waynesburg Coal at West Union, 

 forming with N. dictyopteroides, the greater part of the 

 plants found in some layers. It is very abundant at Cass- 

 ville at the same horizon. The pinnules are often of very 

 large size reaching the length of 6 inches and the width 

 of 1^ inches. It has often a falcate form, and reminds us 

 of the shape of N. Rogersi of Lesqx., bat is proportionally 

 longer. It is confined to horizons above the Pittsburg Coal 

 in West Virginia. 



Odontopteris, Brongt. 



This genus is represented in the Upper Carboniferous 

 fiora of W. Va. by only a few species, mostly of types 

 found in the Permian of Europe. 



The individuals, except of one species, are also rare in 

 occurrence. 



Odojitoptej-is obtusiloba, Var. rarinerdls. PI. X, Fig. 4. 



The fragment, depicted in the above named figure, diif ers 

 from Odordopteris ohtusa, Naum, as figured by Weiss, 

 Geinitz, and others, only in having fewer nerves, and a 

 stronger rachis. The overlapping of the pinnules is pre- 

 cisely the same with that shown by Geinitz: "Dyas,'' PL 

 XXVIII, Figs. 1 — 4. It occurs in a bed of red shale 400 

 feet above the Waynesburg Coal, at Bellton, Marshall Co., 

 Va. 



Odontopteris nervosa, Sp. no v. PL X, Figs. 1-2. 



( Frond bi-pinnatifid ; pinnules very deciduous, oblong- 

 linear, at the insertion cut into rounded or oval segments 

 nearly to the rachis, the segments towards the extremity 

 less and less deeply cut, at the extremity entire ; nerves 

 rather distant, very strong, and sharply defined, passing 

 from the entire base of the lobes with no median nerve.) 



The plant has a striking similarity to some forms of the 

 Odontopteris obtusa, but is distinguished by the fewer and 

 coarser nerves. Fig. 2. shows the tendency of the termi- 

 nations of the pinnules to become entire, a feature shown 

 also in 0. ohtusa. The specimens found, which are not un- 



