CORALS AND BRYOZOA. 
169 
Fenestella (Polypora) l^vinodata. 
PLATE XLII, FIGS. 12-15. 
Fenestella levinodata, Hall. Trans. Albany Institute, vol. x, abstract, p. 28. 1881. 
“ ( Polypora) laBvinodata, Hall. Report of State Geologist for 1885, advance sheets. Expl. pi. 33, 
figs. 12-15. 18S3. 
Bryozoum infundibuliform. Branches moderately slender, width above a bifur¬ 
cation .35 mm., increasing to .50 mm., straight or sinuous, angular, with a 
very slight carina. Interstices wider than the branches. Dissepiments 
strong, width .50 mm. or more, angular, carinated, on a plane with the 
branches, six or seven in the space of 5 mm. Fenestrules oval, length 1.20 
mm., width .60 mm. or slightly more. 
On the celluliferous face the branches are rounded. Dissepiments very 
short, width .65 to .70 mm., depressed. Fenestrules smaller than on the 
opposite face. Cell apertures in from three to five ranges, twenty in the 
space of 5 mm., distant less than the diameter of an aperture. Ranges 
of apertures separated by slightly elevated ridges. 
Formation and, locality. Upper Helderberg group, Falls of the Ohio river. 
Fenestella (Polypora) rustica, n. sp. 
PLATE XLIH, FIGS. 10-13. 
Bryozoum infundibuliform, fronds large, irregular. Branches strong, width 
above a bifurcation .75 min., increasing to from 1.60 to 2 mm., sometimes 
straight, but frequently irregular, rounded ; sometimes the surface is concave 
immediately below a bifurcation ; on the specimens observed it is smooth; 
bifurcations comparatively frequent. Interstices as wide or wider than 
the branches. Dissepiments strong, width .85 mm., rounded, very nearly on 
a plane with the branches and frequently oblique to them, occurring at 
irregular intervals. Fenestrules varying in shape, usually sub-quadrangular 
or oval, often lanceolate immediately above a bifurcation, length from 2.50 
to 4 mm., width from .75 to 1.25 mm., occasionally a little narrower. 
On the celluliferous face the branches are rounded or sub-angular. Dis¬ 
sepiments rounded, sometimes slightly carinated, much depressed. Fenes- 
