CORALS AND BRYOZOA. 45 



Fenestella Cleia. 



PLATE XX, FIGS. U, 15. 



Fenestella Cleia, Hall. Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 169. 1879. 



Report of State Geologist for 1883. Expl. pi 2n, figs. 14, 15. 188H. 



Bryozoum infundibuliform, broadly spreading; branches moderately strong, 

 somewhat rigid, sub-angular or rounded, smooth in the specimens observed, 

 regularly and rapidly increasing in size to the bifurcations, which occur at 

 intervals of from 3 to 5 mm. Interstices generally narrower than the 

 branches Dissepiments slender, rounded ; eight in the space of 5 mm. ; 

 not expanding, slightly depressed below the plane of the branches. Fenes- 

 trules sub-quadrangular, occasionally square near the base. 



On the celluliferous face the branches are obtusely angular and the dissepi- 

 ments depressed. The fenestrules appear narrower than on the opposite 

 face. Cell apertures small, circular, in two ranges, opening directly out- 

 ward ; twenty in the space of 5 mm. ; separated by less than the diameter 

 of an aperture : margins elevated, very slightly indenting the borders of the 

 fenestrules. The middle of the branch is occupied by a low rounded ridge, 

 with frequently a slight groove on each side. 



'Width of branches from .25 to ..30 mm., increasing to 50 mm.; diameter 

 of dissepiments about .20 mm. ; length of fenestrules about .40 mm., width 

 from .25 to .35 mm. 



This species somewhat resembles F. quadrula, but the branches increase 

 mere rapidly in size, the dissepiments are stronger, and on the celluliferous 

 face the carina is very slightly elevated, while in that species the carina is 

 elevated and has an expanded, crenulated summit. 



Formation and locality. Lower Helderberg group, Clarksville, N. Y. 



Fenestella Hestia. 



PLATE XX, FIGS. 12, IS. 



FHaitella Hexlin. Hall. Thirty-second Rept. N. Y. SUte Mus. Nat. Hist., p. 168. 1879. 



Report of State Geologist for 1882. Expl. pi. 20, figs. 12, 13. 1883. 



This species is represented in the collections by a small fragment showing the 

 non-celluliferous face. The branches are moderately strong, gradually in- 



