DESCRIPTION OF SPECIES. PP. 87 



going off at an acute angle, somewhat arcuately diverging, 

 strong and rigid, extending to the apex ; 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 without nerves.) 



This plant has a close resemblance with Ooniopteris 

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

 this sx)ecies b}* Geinetz, in his Steinkohl. von Sachs, but 

 its strong forking nerves and thick parenchyma distinguish 

 our plant. In Fig. 2, PL 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 pinnse, 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 lohata. Sp. nov.. PL XXXI, Fig. 4. 



(Frond, simply pinnate ; rather slender and delicate ; 

 pinnules oblong, crenately lobed, or nndulate ; primary 

 nerve strong, and distinctly marked ; lateral nerves passing- 

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

 to form a tiabellate group in segment of the j)innule, 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. 



Tliis genus is remarkable for tlie 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 Lcjwer Productive Measures, as well as in 



s 



