96 Twenty-sixth Report on the State Museum. 



outside. Pores circular or a little elongate, their margins elevated, 

 projecting on the upper side into a slight roof-like covering over the 

 pore. Branches about six in one-tenth of an inch. 



This species is distinguished by the compact and closely arranged 

 branches even when the striae or asperate character of pores are 

 removed. It is a much more delicate species than any of the 

 preceding. 



Formation and locality. — In shaly limestones of the Lower Hel- 

 derberg group, at Schoharie, ^N'ew York. 



Fenestella SYLVIA n. sp. 

 Bryozoum forming large funnel-shaped fronds, with a small attached 

 base, rapidly spreading and becoming much folded toward the outer 

 margin. Branches very slender and closely approximate. Outer or 

 non-poriferous side of the frond in well preserved specimens distinctly 

 striated longitudinally. Dissepiments closely arranged, rounded, 

 appearing nearly as strong as the branch on the outer side of the 

 frond, angular on the opposite side. Fenestrules small, quadrangular 

 on the surface, round or oval within, a little longer than wide. 

 Pores minutie, round, slightly elevated, three in the length of the 

 fenestrule. About seven branches in the space of one-tenth of an 

 inch, where there are no bifurcations ; at the bifurcations sometimes 

 ten in the same space ; five to seven dissepiments in the space of one- 

 tenth of an inch. The edge of the carina, between the ranges of 

 pores, when well preserved, is slightly rugose or asperated. 



This species resembles F. nervia^ but lias more slender and closely 

 arranged branches, more frequent dissepiments and consequently 

 smaller fenestrules and fewer pores. 



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

 of the Lower Helderberg group, on Slingerland's farm, near Clarks- 

 ville, Ifew York. 



Genus POLYPOEA McCoy. 



POLYPORA LiLIA n. Sp. 



Bryozoum forming small fan-like fronds (not cup-shaped), attached 

 by the base to foreign bodies. Branches small, irregular, anastomoz- 

 ing, connected at unequal distances by the dissepiments, poriferous 

 on one side and obscurely striate on the other. Dissepiments very 

 short, comparatively distant, widening at their junction with the 

 branches. Fenestrules elongate-oval or elliptical, their length often 



