Orthog. 



566 



Orthogoniopteris gilberti, continued. 

 XH-AHi 



Geol. 511. Vol.5, I5f73, Plate Iff. 



Orthonema {MicheUa) conicum. Meek and Worthen, 



Proc. Acad. Nat. Sci. Phil. 

 1866, Geo. Sur., 111., vol. 5, 1873, 

 page 590, plate 29, figs. 5^5, nat 

 size ; 5, in which lower turns 

 project a little just above the 

 suture, with faint traces of two ridges above angle of lower 

 whorl; <?, another, plainer case. (J and g may be of another 

 species.) Macoupin Co., 111. Lower part oiooal measures. XII L 



Orthonema newberryi, Meek, Proc. Acad. Nat. Sci., Phila., 



1871.— Pal. Ohio, Vol. 1, page 

 217, plate 20, fig. Za natural 

 sise^ dorsal side; 3J, same 

 magnified to show markings. 

 Gorniferous limestone., Villa. 



Orthonema obsoleta. Meek, Proc. Acad. Nat Sci., Phila- 

 delphia, 1871. Pal. Ohio, Vol. 1, page 218, plate 19, fig. 6a, h. 



