72 Thirty-sixth Report ok the State Museum. 



to about .25 mm., and having on top a thin, very slightly elevated crest. 

 This species, especially on poriferous side, has some resemblance to 

 F. perundulata, but is a much finer frond; the non-poriferous face 

 resembles F. curvata, but the branches are stronger, more compactly 

 arranged, and without spines or prominent nodes; the poriferous side 

 is very dissimilar. 



Formation and locality. ■ Hamilton group; Moscow, Livingston 

 county, JST. Y. 



Fekestella strata, n. sp. 



Bryozoan infundibuliform ; largest fragment observed five centime- 

 tres long and three wide. 



Branches moderately strong ; widest on the poriferous side, where 

 they are .5 mm. in width ; on non-poriferous side about .25 mm.; ex- 

 tremely sinuous, forming at the sides of the branch alternating and reg- 

 ular convexities and concavities ; the convexities of adjacent branches 

 touching and coalescing ; on poriferous side the branches are angular, 

 having a slight keel, which is conspicuously nodose, owing to that side 

 of the branch being the narrowest and the angular tops of the branches 

 coalescing; the sinuosity of the branches is much greater on the non- 

 poriferous side, forming diamond-shaped elevations ; the frond pre- 

 senting a reticulated appearance, and it is with great difficulty that 

 the direction of the branches can be determined. 



Dissepiments ; the points of coalition or anastomosing are in width 

 equal to or a little more than that of the branches ; four in the space 

 of five millimetres. 



Fenestrules on non-poriferous side oval, sometimes nearly circular, 

 usually about one millimetre in length ; width two-thirds to three- 

 fourths the length ; the size and shape, however, are somewhat vari- 

 able ; on non-poriferous side appearing much smaller both as regards 

 length and breadth ; the branches on poriferous side, though sinuous, 

 present a much straighter appearance than on the non-poriferous side. 



Cells in two ranges, opening directly upward or slighly laterally, 

 minute, circular; .14 mm., or a little less, in diameter ; distance apart 

 more than the diameter of an aperture, about eighteen in the space of 

 five millimetres; margins thin, distinctly elevated; space between the 

 ranges of apertures carinated ; carina moderately thin, elevated about 

 .20 mm., sinuous and finely crenulate. 



This species in its sinuous, anastomosing branches resembles F. 

 inflexa, but the branches are more slender, and on the non-poriferous 

 side it has two ranges of apertures, divided by a carina, while that 

 species has three or more ranges without carina. In F. perundulata 

 the frond on non-poriferous face has a much more irregular appear- 

 ance, and is more decidedly anastomosing. 



Formation and locality. Hamilton group ; Moscow, Livingston 

 county, N. Y. 



