64 Thirty-sixth Eeport on the State Museum. 



larly flexuous. Sometimes, on the dissepiments, the carinations meet, 

 coalesce, and form a carination across the dissepiments ; at others 

 there is a space between of .25 mm.; sometimes this space is smooth 

 and deeply channeled across the dissepiment, at_ others the dissepi- 

 ment has a carina connecting the carina? of the adjacent branches ; 

 the two faces present such a different appearance, that were it not for 

 the fact that both sides of the same specimen^ are seen they would be 

 very easily mistaken for different species. 



Formation and locality. Hamilton group ; Moscow, Livingston 

 county, N. Y. 



gj. Fenestella assita. n. sp.- 



Bryozoan probably infundibuliform, though occurring Only in frag- 

 ments in the present collections ; largest fragment observed two and 

 one-half centimetres long, two centimetres wide. 



Branches moderately strong, gradually enlarging in size to the bifur- 

 cations, which are distant from each other from three to fourteen 

 millimetres; width of branches on non-poriferous side .33 mm., on 

 poriferous side about .50 mm.; space between branches less than the 

 width of the branches, ten branches in the space of five millimetres; 

 on non-poriferous side branches rounding, carinated; carina thin, ele- 

 vated about .20 mm., and obscurely nodose. 



Dissepiments strong, .33 mm. in width, eight in the space of five 

 millimetres, expanding at their junction with the branches ; on non- 

 poriferous side, on a plane with the branches, carinated ; on poriferous 

 side depressed, carinated. 



Fenestrules oval, about .33 mm. in length ; width on non-poriferous 

 side about two-thirds the length ; on poriferous side they are very 

 obscure, either not perceptible or appearing as very narrow slits. 



Cell apertures in two and three ranges; the greater part of the 

 length of the branch has only two ranges ; in a branch which is eleven 

 millimetres long before bifurcating, eight millimetres of that length 

 has two ranges of cells, and three millimetres three ranges; apertures 

 small, circular, opening directly upward, about .16 mm. in diameter; 

 distance between apertures less than the diameter of an aperture, 

 twenty apertures in the space of five millimetres ; margins distinctly 

 elevated; space between ranges of apertures carinated; carina strong, 

 not much elevated, and having minute spines situated at quite regular 

 distances from each other, about twenty in the space of five milli- 

 metres ; the ranges of apertures on adjacent branches are nearly 

 contiguous. 



Formation and locality. Hamilton group ; New York. 



Fekestella inflexa, n. sp. 



/vjr 



Bryozoan infundibuliform ; fronds large, largest fragments seen 

 seven millimetres across. 



Branches fiexuous, forming on each side of a branch regular and 

 alternate convexities and concavities ; the convexities of the opposite 



