128 
PALEONTOLOGY OF NEW YORK. 
Fenestella biserrulata. 
PLATE L, FIGS. 6-11. 
Fenestella biserrulata, 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. 
Bryozoum infimdibuliform. Brandies 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 latijunctura. 
PLATE SLVIII, FIGS. 1-5. 
Fenestella latijunctura, Hall. Trans. Albany Institute, vol. x, abstract, p. 31. 1881. 
“ “ “ Report of State Geologist for 1885, advance sheets. Expl. pi. 48, figs. 1-5. 
1886. 
Bryozoum infundibuliform, fronds large. Branches moderately slender, width 
above a bifurcation .25 to .30 min., increasing to .50 mm., irregular, usually 
angular, slightly carinated, sometimes rounded, with more or less prominent, 
