110 
PALEONTOLOGY OF NEW YORK. 
Fenestella serrata. 
PLATE XLVII, FIGS. 11-19. 
Fenesttlla serrata, Halt.. Trans. Albany Institute, vol. x, abstract, p. 28. 1881. 
Bryozoum infundibuliform, frond compact. Branches slender, width above a 
bifurcation from .20 to .25 mm., increasing to .40 or .42 mm., very gradually 
enlarging, rounded or sub-angular, sometimes smooth but usually nodose, the 
nodes on some of the fronds being very prominent, sometimes granulose; 
bifurcations distant. Interstices usually of about the same width as the 
branches, but sometimes one and one-half times and occasionally twice the 
width. Dissepiments slender, width from .20 to .25 mm., rounded, slightly 
depressed, eight or nine in the space of 5 mm. Fenestrules oval, length 
usually from .35 to .40 mm., width .25 mm. 
On the celluliferous face the branches are angular. Dissepiments acutely 
angular, carinated, depressed below the plane of the branches. Fenestrules 
of the same appearance as on the opposite face. Cell apertures in two ranges, 
opening laterally, twenty-two in the space of 5 mm., separated by 
slightly less than the diameter of an aperture: margins thin, slightly ele¬ 
vated. Surface carinated; carinae strong, elevated, with sharp, triangular, 
prominent nodes, about equal in number to the cell apertures. 
The non-celluliferous face resembles very nearly some varieties of F. stellata. 
The celluliferous face may be distinguished by the sharply angular branches 
and dissepiments, which give to this .face of the frond the appearance of being 
divided into small squares, a feature distinguishing it from any other species. 
Formation and locality. Upper Helderberg group, Falls of the Ohio river. 
Fenestella verrucosa, n. sp. 
PLATE XLII, FIG. 11; PLATE XLVI, FIGS. 22,24. 
Bryozoum infundibuliform, fronds large, compact. Branches slender, width 
above a bifurcation .20 to .25 mm., increasing to .40 and .45 mm., with 
numerous small nodes, closely and irregularly disposed. Usually, when the 
