114 PALMONTOLOGY OF NEW YORK. 



On the celluliferous face the branches are angular. Dissepiments rounded, 

 depressed. Cell apertures in two ranges, fifteen in the space of 5 mm , 

 separated by the diameter of an aperture. Branch carinated, carina slightly 

 elevated, but conspicuous. 



This species may be readily distinguished by its obtusely angular, carinated 

 branches. 



Formation and locality. Upper Helderberg group, near Caledonia, N. Y. 



Fenestella dispanda. 



PLATE XLIV, FIGS. 1-4. 



Fenestella dispandus, Hall. Report of State Geologist for 1885, advance sheets. Expl. pi. 44, figs. 



1-4. 1886. 



Bryozodm i n fund ibuli form, of lax growth. Branches slender, rounded, width 

 above a bifurcation .25 mm., increasing to .50 mm. Interstices two or three 

 times the width of the branches. Dissepiments very slender, width .20 mm., 

 frequently oblique to the branches, angular, slightly depressed, seven in the 

 space of 5 mm. Fenestrules sub-quadrangular, length about 1.25 mm., width 

 .50 mm. 



On the celluliferous face the branches are angular. Dissepiments angular, 

 depressed Fenestrules of the same appearance as on the opposite face. 

 Cell apertures in two ranges, eighteen in the space of 5 mm., separated 

 by slightly more than the diameter of an aperture ; carinas slight. 



This species may be distinguished by the slender branches and the straggling 

 appearance of the frond. 



Formation and locality. Upper Helderberg group. Western New York, par- 

 ticular locality not recorded. 



Fenestella singularitas. 



PLATE XLVI, FIGS. 12-16. 

 Penentdla singvXaritas, Hall. Trans. Albany Institute, vol. x, abstract, p. 29. 1881. 



Brvozodm infundibuliform. Branches moderately slender, width above a bifur- 

 cation .25 mm., increasing to .45 mm., rounded, finely striated ; generally 



