Upper Helderherg Gfvup. 



165 



in from three to five ranges ; apertures circular, twenty-five in the 

 space of five mm., arranged in longitudinal rows, margins very strong 

 oblique resembling ridges. 



Locality — Falls of the Ohio river. 



Fenestella distans, n. sp. 



Infundibuliform, large; width of branches from .5 to 1.3 mm., 

 on non-celluliferous side, branches angular, below bifurcations, flat- 

 tened, sometimes carinated and nodose ; dissepiments, .5 mm. in width, 

 rounded or angular ; fenestrules subquadrangular, length, 2.75 mm., 

 width, to 1.3 mm. ; cellules in from three to seven ranges ; apertures 

 circular, fourteen in the space of five mm. ; longitudinal ranges of 

 apertures are separated by a narrow carina ; there are also elongated 

 conical nodes, which occur at irregular but frequent intervals. 



Locality — Near Buffalo, N. Y. 



Fe^^estella flabelltformis, n. sp. 

 Flabelliform, width of branches from .G to 1 mm ; dissepiments .50 

 mm. in width, frequently oblique to the branches ; fenestrules sub- 

 quadrangular, 2.3 mm. in length, 1 mm. in width ; cellules in three 

 and four ranges, sixteen in the space of five mm. 



Locality — Shortsville, near Manchester, N. Y. 



Fenestella perangulata, n, sp. 

 Broadly infundibuliform ; width of branches from .5 to 1 mm. ; on 

 non-celluiiferous side angular, slightly carinated ; just below the bi- 

 furcations on carina is a small conical node ; dissepiments, .35 mm. 

 in width; fenestrules usually subquadrangular; length from .75 to 1 

 mm. ; width, .65 mm.; cellules in from two to lour ranges; apertures 

 circular or oval, opening obliquely, eighteen apertures in the space of 

 five mm. ; ranges sometimes separated by a ridge. 



Locality — New York. 



Fenestella celsipora, n. sp. 

 Bryosoum infundibuliform, broadly expanding, usually broadly pli- 

 cated in the direction of the branches; inner face of the frond cel- 

 Inliferous ; branches moderately strong, very gradually increasing in 

 size to the bifurcations which occur at intervals of from fifteen to 

 forty mm. Dissepiments on non-celluliferous side from .25 to .35 of 

 one mm. in width and nearly on a plane with the branches; on the 

 celluliferous side narrower, angular or slightly carinate. Cellules in 

 from two to five ranges ; apertures circular or oval, opening obliquely 



