58 PALEONTOLOGY OF NEW YORK. 



node opposite the dissepiments. Width of the interstices about equal to that 

 of the branches. Dissepiments very slender, angular, slightly depressed 

 below the plane of tlie branches, eight in the space of 5 mm. Fenestrules 

 8ub-quiulrangular, width from one-half to two-thirds the length. 



On the celluliferous fiice the branches are angular and the dissepiments 

 rounded and depressed. The fenestrules appear more oval in form than on 

 the opposite face. Cell apertures small, circular, in two ranges, opening 

 directly outward, twenty-five in the space of 5 mm., distant less than the 

 diameter of an aperture : margins elevated and indenting the borders of the 

 fenestrules. Branches carinated ; the summits of the carinaB are expanded, 

 angular and connected by lateral processes which meet midway between the 

 branches, coalesce and form a flattened zigzag ridge. The lateral processes 

 correspond in number and are situated over the cell apertures. The inter- 

 stices are oval, and wider than long. 



Width of branch above a bifurcation. .20 mm., increasing to .50 mm. ; dis- 

 sepiments from .18 to .20 mm. in diameter; length of fenestrules from .40 

 to .60 mm. ; height of carina .20 mm. 



This form differs from F. {H.) biserialis in its more delicate growth, smaller 

 branches, and the more slender and closely arranged dissepiments. 



Formation and locality. Lower Helderberg group, near Clarksville, N. Y. 



POLYPORA, McCoy. 1845. 

 Fenestella (Polypora) Eudora. 



PLATK XLX, FIGS. 3, 4, 6 ? (i-lU. 



Fau$teUa Eudora, Hall. Thirty-second R«pt. N. Y. State Mus. Nat. Hist., p. 165. 1879. 

 " " " Report of State Geolojfist for 1882. Expl. pi. 19, fiifs. 3-10. 1883. 



Bryozoum broadly infundibuliform, growing from a very slender pedicel, 

 having a diameter less than 1 mm. Branches moderately slender, very 

 gnidually increasing in size to the bifurcations, which occur at intervals of 

 from 3 to 15 ram., and are more frequent near the base than above. On the 

 non-cell id iferous fjvce the branches are rounded, sometimes flattened just 

 below a bifurcation, marked by from five to seven very fine, distinct striae 



