422 PALEONTOLOGY OF OHIO. 



point. The medial nerve is strong, and extends to the apex. The veins 

 are once or twice dichotomoiis, forking general!}' near the midrib, curv- 

 ing and extending parallel to the border at a slightly acute angle, bend- 

 ing upward a little upon nearly reaching it. 



The fragment shown in fig. 3 indicates a very large, straight leaf, which 

 measures 7 centimeters in length and If centimeters in width. Another 

 leaf, found in the same location, is slightly curved. Fig. oa shows the 

 aj^ex of a leaf, and fig. 36 the usual venation. The fragments all show a 

 series of dots, which at first suggest fructification, but as they are 

 situated between the veins, they are probably merely dots of an iron 

 oxide. While the venation is similar to A. teeniopteroides, Bun., the leaf 

 is much larger and more pointed. If a true Alethopteris, its leaf is larger 

 than that of any described species of that genus, except A. ingens, Dav.-., 

 from which it differs somewhat in venation. 



Locality same as the last. 



Hymenophyllites Ballantini (sp. nov.). 



Plate 49, fig. 1. 



Frond tripinnatifid. Primary rachis thick, striated, flexuous. Pinnae 

 distant, alternate, decurring, with a thickened rachis. Pinnules numer- 

 ous, alternate, once or twice lobed, decurrent; ultimate divisions linear, 

 narrow, short, acute, either free to the base or united above the middle ; 

 two to three millimeters long and one-half millimeter broad, or less. 

 Veins thin, dichotomous, each division extending to the apex of the 

 lobe. At the base of the decurrent secondary rachis some pinnules are 

 attached to the main rachis, even descending along it. 



I know of no species to which this one may be comjmred. Its first 

 and general appearance is that of a Sphenophyllum. 



Locality same as the last. 



Eremopteris marginata (sp. nov.). 



Plate 52, fig. 1 and fig. 2. 

 Frond bi-pinnately divided. Pinnse alternate, divided into numerous 

 diverging, oblique, acuminate, confluent lobes. Veins numerous, divid- 

 ing like the pinnse. Pinnules decurring along the rachis. Rachis of 

 medium size, bordered by a series of half round compressed apj^endages 

 resembling small scales, and forming a narrow crenulate border or wing. 



