CORALS AND BRYOZOA. 
125 
Fenestella granifera. 
PLATE L, FIGS. 12-14, 16. 
Fenestella ( Hemitrypa) granifera, Hall. Trans. Albany Institute, vol. x, abstract, p. 33. 1881. 
“ granifera, Hall. Report of State Geologist for 1885, advance sheets. Expl. pi. 50, figs. 12-14, 16. 
1886. 
Bryozoum infundibuliform, fronds very large, with frequent broad folds or un¬ 
dulations on a line with the branches. Branches moderately slender, width 
above a bifurcation .30 mm., increasing to .45 mm., very gradually enlarging, 
sub-parallel, frequently sinuous, flattened, sub-angular or angular, with a row 
of fine granules along the middle; bifurcations distant. Interstices wider 
than the branches. Dissepiments strong, width usually .55 mm., flattened, 
on a plane with the branches, four in the space of 5 mm. Fenestrules broadly 
oval, length .70 nnn., width from .40 to .50 mm. 
On the celluliferous face the dissepiments are rounded, depressed. Fen¬ 
estrules more elongate-oval than on the opposite face. Cell apertures in two 
ranges, twenty in the space of 5 mm., opening directly outward, separated 
by less than the diameter of an aperture. Surface between ranges of aper¬ 
tures carinated; carinse strong with the summits expanded, and having on 
each margin a row of minute nodes. 
Formation and locality. Upper Helderberg group, near Leroy village, Genesee 
county, N. Y. 
d. Forms having the ca.rinee expanded midway of their height and contracting above, 
with the margins nodose. 
Fenestella semirotunda. 
PLATE XLIX, FIGS. 11-22. 
Fenestella semirotunda, Hall. Trans. Albany Institute, vol. x, abstract, p. 32. 1881. 
Bryozoum broadly infundibuliform, compact. Branches slender, width above 
a bifurcation .20 to .25 mm., increasing to .40 and .45 mm.; transverse section 
sub-cuneiform, thickness about 1 mm.; anastomosed or connected by short 
dissepiments, sinuous or zig-zag, rounded or angular, slightly carinated, fre- 
