136 PALEONTOLOGY OF NEW YORK. 



ranges, opening outward, twenty-two in the space of 5 mm.; closely disposed ; 

 margins thin, distinctly elevated. Surface between ranges of apertures cari- 

 nated ; carince thin, height .60 mm., summits frequently sinuous ; scaloe very 

 thin, fourteen in the space of 5 mm., directed obliquely away from the 

 base for a short distance, then abruptly bending and continuing toward the 

 base, the latter portion having twice the depth of the former. Fenestrules 

 narrow, elongate oval. Summit of carina not elevated above the scalar. 



The celluliferous face of this species closely resembles that of F. (U.) fasti gata, 

 but the dissepiments of that species, so far as observed, are never elevated above 

 the branches, and there is frequently a .slight elevation around the fenestrules. 

 The scaloB of both species, near the surface, are obliquely directed from the 

 base, but those of this species are more closely disposed, there being fourteen 

 in the same space occupied by six in that one. From F. (U.) stipata it may 

 be distinguished by its somewhat coarser and more regular aspect, its larger 

 fenestrules, its thinner and more oblique scalaa. The summit of the carina is 

 thin and not elevated above the scalae. 



Formation and locality. Upper Helderberg group. Falls of the Ohio river. 



Fenestella (Unitrypa) lata. 



PLATE LU, FIGS. I-IO. 



thiesteUa (Hemitryi>a) lata. Hall. Trans. Albany Institute, vol. x, abstract, p. 34. 1881. 

 Unitrypa spatiosa, Hall, in error. Report of State Geologist for 1884. PI. 2, fig. 12. 1885. 



Bryozoum infundibuliform, fronds large, with frequent, broad, radial undulations 

 or folds. Branches slender, width above a bifurcation .30 mm., increasing 

 to .50 mm., very gradually enlarging, often the same size for nearly the entire 

 length, rounded or flattened, nodose ; nodes small, conical, sometimes forming 

 a row along the middle of the branch, at other times irregularly disposed ; 

 bifurcations distant. Interstices as wide as the branches. Dissepiments 

 slender, width .25 to .30 mm., rounded, on a plane with the branches, four 

 in the space of 4 mm., carinated ; carinoe thin, slightly elevated, but very 

 distinct. Fenestrules oval, length .70 to .75 mm., width .35 mm. 



On the celluliferous face the dissepiments are rounded, carinated, much 

 depressed. Fenestrules narrower than on the opposite face. Cell apertures 



