144 PALEONTOLOGY OF NEW YORK. 



This face of the frond has precisely the appearance of the non-celluliferous 

 face of a Fenestella, with slender distant branches and dissepiments. The 

 under side of the carina and scaljE have a stronger appearance than the upper 

 face. When the carina is broken away, it gives to the brjanch the appearance 

 of having a line of small nodes along the middle. 



This species will be easily distinguished on the non-celluliferous face by the 

 conspicuous apertures in the dissepiments ; on the celluliferous face by the 

 slender, distant scalao connecting the carinae, and the angular appearance of that 

 surface of the frond. 



Formation and locality. Upper Helderberg group, Walpole, Ontario, Canada. 



A. Forms having both the branches and dissepiments carinated, carina much expanded 

 above ; the two faces of the frond similar in appearance. 



LOCULIPORA, RoMiNGER MS., nov. gen. 



Compare Semicoscinium, Prout. 1859. 



Fenestella (Loculipora) circumstata, n. sp. 



PLATE LIV, FIGS. '22-25. 



BRyozouM consisting of large infundibuliform fronds of irregular appearance. 

 Branches moderately slender, width above a bifurcation about .35 mm., and 

 continuing of essentially the same size until within a short distance of a 

 bifurcation, where the width is about .50 mm., usually decidedly zig-zag, 

 sometimes so irregular that the branch can be tr.aced only a short distance, 

 the frond presenting a somewhat regular, reticulate appearance ; sometimes 

 anastomosing, but usually connected by a short dissepiment, acutely angular, 

 slightly carinated ; bifurcations infrequent. Interstices wider than the 

 branches. Dissepiments strong, width variable, sometimes not wider than 

 the branches, but usually from .50 to .60 mm., angular, carinated, on a plane 

 with the branches, three or four in the space of 5 mm. Fenestrules broadly 

 oval, length from .75 to 1 mm., width .50 to .60 mm., sometimes nearly equal 

 to the length. 



