CORALS AND BRYOZOA. 
161 
Fenestella (Polypora) distans. 
PLATE XXXVII, FIGS. 2-10, 15, 16 ; and PLATE XLIV, FIG. 7. 
Fenestella distans, Hall. Trans. Albany Institute, vol. x, abstract, p. 24. 1881. 
“ ( Polypora) distans, Hall. Report of State Geologist for 1882. Expl. pi. 30, figs. 2-5, 15, 16. 
1883. 
“ “ “ “ 1 Report of State Geologist for 1882. Expl. pi. 30, figs. 6-10. 1883. 
“ “ “ “ Report of State Geologist for 1885, advance sheets. Expl. pi. 44, 
fig. 7. 1S86. 
Bryozoum consisting of infundibuliform fronds of somewhat lax and irregular 
growth. Branches strong, width above a bifurcation .50 mm., increasing to 
1 or 1.50 mm., acutely angular, with small nodes, occurring at irregular 
intervals. Interstices equal in width or wider than the branches. Dissepi¬ 
ments comparatively slender, width .40 mm., rounded or sub-angular, four or 
five in the space of 10 mm. Fenestrules sub-quadrangular or oval, width 
variable, usually from 1 to 1.50 mm. 
On the celluliferous face the branches are rounded. Dissepiments flattened; 
depressed, generally traversed by a shallow channel, which does not extend 
upon the branches. Fenestrules narrower than on the opposite face. 
Cell apertures in from three to six ranges, fourteen in the space of 5 mm., 
nearly in contact; ranges separated by a narrow sinuous ridge ; margins 
slightly elevated. When worn or macerated, the cell margins and inter¬ 
mediate ridges are obsolete, the apertures appearing immersed and in contact; 
disposed in quincunx order. 
Formation and locality. Upper Helderberg group, near Buffalo, N. Y. 
Fenestella (Polypora) flabelliformis. 
PLATE XXXVII, FIGS. 11, 12. 
Fenestella flabelliformis, Hall. Trans. Albany Institute, vol. x, abstract, p. 23. 1881. 
“ (Polypora) flabelliformis. Hall. Report of State Geologist for 1882. Expl. pi 30, figs. 11, 12. 
1883. 
Bryozoum flabelliform, non-celluliferous face not observed. 
On the celluliferous face the branches are moderately strong; width above 
a bifurcation .50 mm., increasing to 1 mm., rounded. Interstices wider than 
