CORALS AND BRYOZOA. 153 



This species will be distinguished by the essentially parallel branches, scarcely 

 increasing in size, and the peculiarly rigid appearance of the celluliferous face. 

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



Fenestella (Polypora) elongata. 



PLATE XLII, FIGS. 8, 4. 

 Fenestella (Polypora) elongata. Hall. Report of State Geologist for 1882. Expl. pi. 33, figs. 3, 4. 1883. 



Bryozocm inlundibuliform. Branches moderately strong, very gradually en- 

 larging, width above a bifurcation .40 mm., increasing to .70 mm., flattened, 

 sub-angular, with a comparatively strong, slightly elevated carina along the 

 middle. Interstices of about the same width as the branches. Dissepiments 

 slender, width .20 mm., angular, slightly depressed. Fenestrules oval, length 

 1.75 mm., width about .50 mm. 



On the celluliferous face the branches are slightly rounded. Dissepiments 

 rounded, much depressed. Fenestrules a little narrower than on the opposite 

 face. Cell apertures in from two to four ranges, very minute, sixteen in the 

 space of 5 mm., .separated by twice the diameter of an aperture. Space be- 

 tween the apertures striated. 



This species may be distinguished from F. (P.) orbirama, by its coarser appear- 

 ance and its much larger fenestrules ; from all other species by the flattened, 

 carinated branches, the distance between the minute cell apertures and the 

 striated surfiice. 



Formation and locality. Upper Helderberg group, Onondaga Valley, Onondaga 

 county, N. Y. 



Fenestella (Polypora) carinella, n. sp. 



plate XLII, FIGS. 1, 2. 

 Fenettella (Polypora) n. sp.t Hall. Report of State Geologist for 1882. Expl. pi. 33, figs. 1, 2. 1883. 



Bryozoum infundibuliform. Branches moderately strong, width above a bifur- 

 cation .33 mm., increasing to .75 mm., gradually enlarging, straight or very 

 slightly sinuous, angular, slightly carinated ; bifurcations distant. Inter- 

 stices narrower than the branches. Dissepiments very slender, width about 



