128 PALEONTOLOGY OF NEW YORK. 



Fenestella biserrclata. 



PLATE L, FIGS. 6-11. 



Fbnettella buerrulata. Hall. Trans. Albany Institute, vol. x, abstract, p. 30. 1881. 



•' " " Report of State Geologist for 1885, advance sheets. Expl. pi. 50, figs. 6-11. 



1886. 



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

 cation .33 mm., increasing to .70 mm., rounded or sub-angular, with a row of 

 granules along the middle of the branch. Interstices slightly wider than the 

 branches. Dissepiments slender, width .30 mm., rounded, on a plane with 

 the branches, about three in the space of 4.50 mm.; each dissepiment is 

 marked by an elevation which extends upon and along the branch nearly to 

 the next dissepiment, frequently giving angularity to the narrower portions 

 of the branch. Fenestrules oval, length about 1.25 mm., width from .35 to 

 .50 mm. 



On the celluliferous face the dissepiments are rounded, much depressed. 

 Fenestrules slightly narrower than on the opposite face. Cell apertures in 

 two ranges, opening directly outward, "eighteen in the space of 5 mm., sepa- 

 rated by less than the diameter of an aperture. Surface between ranges of 

 apertures carinated, carina about .40 mm. in height, expanding for one-half 

 the height, then contracting ; on each margin of the expanded portion there 

 is a line of minute nodes, about equal in number to the cell apertures. 



This species may be distinguished from similar forms by the large fenestrules. 

 Formation and locality. Upper Helderberg group, Falls of the Ohio river. 



Fenestella latijpnctura. 



PLATE XLVIII, KIGS. 1-6. 



PmaiteUa latijunetura, Hall. Trans. Albany Institute, vol. x, abstract, p. 31. 1881. 



" " " Report of State Geologist for 188.'), advance sheets. Expl. pi. 48, figs. 1-5. 



1886. 



Bbtozoum infundibuliform, fronds large. Branches moderately slender, width 

 above a bifurcation .25 to .30 mm., increasing to .50 mm., irregular, usually 

 angular, slightly carinated, sometimes rounded, with more or less prominent. 



