CORALS AND BRYOZOA. 125 



Fenestella granifera. 



PLATE L, FIGS. 12-14, 16. 



Fenestella (Hemitrypa) granifera. Hall. Trans. Albany Institute, vol. x, abstract, p. 33. 18S1. 



" jrani/era. 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 mm., 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 ; carinae strong with the summits expanded, and having on 

 each margin a row of minute nodes. 



Formalion and locality. Upper Helderberg group, near Leroy village, Genesee 

 county, N. Y. 



d. Forms having the carina expanded midway of their height and contracting above, 



with the margins nodose. 



Fenestella semirotunda. 

 plate xlix, figs. 11-23. 



Fenestella semirotunda. Hall. Trans. Albany Institute, vol. x, abstract, p. 32. 1881. 



Bryozodm 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- 



k 



