DESUKU'TIUN OF SPECIES. PP. 87 



going off at an acute angle, somewhat arcuately diverging, 

 strong and rigid, extending to tlie a^^ex ; lateral nerves 

 thick and rigid, leaving at an acute angle, verging upwards 

 and passing into each tooth, forking near the extremity, 

 the two adjoining lowest ones of adjacent segments meeting 

 abruptly, and interlacing, forming the usual triangular 

 space withtmt nerves.) 



This i^l^nt has a close reseml)lance with Goniopteris 

 arguta (Brongt.) Schimp., especially the plant figured for 

 this species bv Geinetz, in his Steinkohl. von Sachs, but 

 its strong forking nerves and thick parenchyma distinguish 

 our plant. In Fig. 2, PI. XXXI, we depict a pinna as found 

 near a fragment of a stem, which is most probably a por- 

 tion of the primary rachis to which were attached the iso- 

 lated pinnae, which are the only forms found. This frag- 

 ment is stout, rigid, and smooth, agreeing well with what 

 we would expect to be the racliis of a primary pinna. 



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

 West Virginia. 



Cymoglossa lobata. Sp. nov.. PL XXXI. Fig. 4. 



(Frond, simply pinnate ; ratlier slender and delicate ; 

 pinnules oblong, crenately lobed, or undulate ; primary 

 nerve strong, and distinctly marked ; lateral nerves passing- 

 off at an acute angle, and branching dichotomously,- so as 

 to form a iiabellate group in segment of the pinnule, the 

 lowest branch on adjacent sides of two groups meeting at 

 the sinus near the margin of the pinnules and forming tri- 

 angular areas without nerves.) 



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

 West Virginia. 



Alethopteris, Sternb. 



This genus is remarkable for the rarity of its occurrence 

 in the Upper Carboniferous. We have seen but two species 

 above the Pittsburg Coal, and this at only one locality. In 

 the flora of the Lower Productive Measures, as well as in 



