CORALS AND BRYOZOA. 
153 
This species will be distinguished by the essentially parallel branches, scarcely 
increasing in size, and the peculiarly rigid appearance of the celluliferous face. 
Formation and locality. Up}ier Helderberg group, Falls of the Ohio river. 
Fenestella (Polypora) elongata. 
PLATE XLII, FIGS. 3, 4. 
Fenestella ( Polypora) elongata, Hall. Report of State Geologist for 1882. Expl. pi. 33, figs. 3, 4. 1883. 
Bryozoum infundibuliform. Branches moderately strong, very gradually en¬ 
larging, width above a bifurcation .40 mm., increasing to .70 mm., flattened, 
sub-angular, with a comparatively strong, slightly elevated carina along the 
middle. Interstices of about the same width as the branches. Dissepiments 
slender, width .20 nun., angular, slightly depressed. Fenestrules oval, length 
1.75 mm., width about .50 mm. 
On the celluliferous face the branches are slightly rounded. Dissepiments 
rounded, much depressed. Fenestrules a little narrower than on the opposite 
face. Cell apertures in from two to four ranges, very minute, sixteen in the 
space of 5 mm., separated by twice the diameter of an aperture. Space be¬ 
tween the apertures striated. 
This species may be distinguished from F. (P.) orbirama, by its coarser appear¬ 
ance and its much larger fenestrules; from all other species by the flattened, 
carinated branches, the distance between the minute cell apertures and the 
striated surface. 
Formation and locality. Upper Helderberg group, Onondaga Valley, Onondaga 
county, N. Y. 
Fenestella (Polypora) carinella, n. sp. 
PLATE XLII, FIGS. 1, 2. 
Fenestella {Polypora ) n. sp. ? Hall. Report of State Geologist for 1882. Expl. pi. 33, figs. 1, 2. 1883. 
Bryozoum infundibuliform. Branches moderately strong, width above a bifur¬ 
cation .33 mm., increasing to .75 mm., gradually enlarging, straight or very 
slightly sinuous, angular, slightly carinated; bifurcations distant. Inter¬ 
stices narrower than the branches. Dissepiments very slender, width about 
