Upper HeUerberg Group. 



175 



mm.; dissepiments on anastomosed portions, .80 mm. wide; fene- 

 striiles varying from oval to circular; length, .90 mm.; cells in two 

 ranges, immediately below each bifurcation there is an additional cell; 

 fourteen in five mm. ; carinated. 



Locality — Canada West. 



Fexestella (Hemitrypa) granifera, n. sp. 



Width of branches from .20 to one mm.; flattened, rounded or sub- 

 angular; slightly elevated carinas, the carinae and at times other por- 

 tions of branches minutely granulose; dissepiments 90 mm. wide, 

 much expanded; fenestrules broadly oval, length .90, width .66 mm.; 

 cell-apertures in two ranges fifteen in 5 mm. ; carina at first very 

 slender, enlarging midway to the summit, then contracting ; proba- 

 bly connected by lateral bars. 



Locality — Falls of the Ohio river. 



Fenestelea (Hemitrypa) perplex a, sy. 



Width of branches from ,20 to .65 mm., gently rounding to subau- 

 gular with small but very distinct nodes; dissepiments from .20 to .30 

 mm. in width; fenestrules from regularly oval to circular or ob- 

 scurely hexagonal, length, .50, width .33 mm. ; cell-apertures in two 

 ranges twenty-two in 5 mm., space between very thin, sharply ele- 

 vated, having on the summit nodes projecting beyond the sides of the 

 carinae, having the appearance of broken lateral bars. 



LocalHy — Falls of the Ohio I'iver 



Fenestella (Hemitrypa) acaulis, n. sp. 



Width of branches from .25 to .35 mm., rounded or slightly angu- 

 lar, slightly carinated, minutely nodose; dissepiments having a width 

 equal to or greater than the branches on non-celluliferous side, some- 

 times elevated above the branches, connecting and forming prominent 

 angular elevations ; fenestrules subquadrangular, broadly oval, circu- 

 lar, obscurely hexagonal, length .50 mm. ; cell-apertures in two ranges, 

 slightly oval, twenty -five in 5 mm.; carina thin, height equal to that 

 of branch, for one-half the height thin, then expanding; width of the 

 summit one-half that of branch; carina connected by bars, twenty- 

 two in 5 mm. 



Locality — Falls of the Ohio river. 



Fenestella (Hemitrypa) stifata, n. sp. 



Branches straight to zig-zag, width .25 to .35 mm, • regalo-r, cari- 

 nated; dissepiments same v/idth as branch, sometimes forming* con- 



