168 Thirty-second Report on the State Museum. 



Dissepiments slender, from one-half to two-thirds the width of the branch ; 

 nine to ten in the space of five mm., expanding at their junction with the branches ; 

 on non-poriferous side rounded, on poriferous side angular. 



Fenestrules small, subquadrangular to oval ; width from equal to the branch 

 to one-half greater ; length from equal to the branch to twice its width. 



Cell-pores in two ranges, small, round ; opening outward, at an angle of about 

 45° ; three in the space of a fenestrule ; margins elevated, slightly indenting the 

 borders of the fenestrule ; space between ranges of cell-pores angular, but not 

 carinated ; striated, and having in the centre a line of nodes. 



Formation and locality. In upper layers of shaly limestones of the Lower 

 Helderberg group, near Clarksville, N. Y. 



Fenestella Philia, n. sp. 



(PLATE XXj FIGS. 9-11.) 



Bryozoum fan-shaped, undulating. Branches slender, closely arranged near 

 base, becoming more distant above ; from twelve to sixteen in the space of five 

 mm. ; on non-poriferous side rounded or slightly angular, apparently smooth. 



Dissepiments from two-thirds to nearly equal the width of branches ; nine in 

 the space of five mm., not enlarging at their junction with the branches ; on non- 

 poriferous side rounded, and on the same plane as the branches ; on poriferous 

 side angular and depressed. 



Fenestrules subquadrangular, variable in width, length from two to two and 

 one-half times the width. 



Cell-pores in two ranges, small, round or slightly oval ; distance from each 

 other greater than their diameter, three in the space of a fenestrule, opening 

 nearly directly outward, except when occurring opposite the dissepiment, where 

 they open nearly directly upward ; space between ranges of pores carinated, 

 carina but little elevated, and having a line of nodes on the top ; nodes distinct, 

 sharp, and about equal in number to the cell-pores. 



Formation and locality. Lower Helderberg group, Albany county, N. Y. 

 Fenestella Hestia, n. sp. 



(PLATE XX, FIGS 12, 13.) 



A species with moderately strong branches and subquadrangular fenestrules. 

 The non-celluliferous side is distinctly pustulose. The celluliferous side is 

 unknown. 



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

 Fenestella junceus, n. sp. 



(PLATE XX, FIGS. 16-18.) 



Bryozoum probably cyathiform. Branches slender ; from eight to eleven in 

 the space of five mm., frequently presenting a crowded appearance; on non- 



