68 Thirty-sixth Eepoet on the State Museuit. 



Cells in two ranges, opening slightly laterally ; apertures small, 

 circular; diameter about ,16 mm.; distance apart equal to or a little 

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

 five millimetres; margins slightly elevated ; space between the rows 

 of apertures carinated ; carina thin, sharp, consisting of two plates, 

 which coalesce near the crest; height of carina .75 mm., or nearly 

 twice the width of the branches. 



This species is very characteristic and is easily recognized from either 

 surface, from non-poriferous by the flat branches, with elevation around 

 the fenestrule ; and from the poriferous face by the thin greatly ele- 

 vated carina, in which respects it differs from any other known species 

 of this formation. 



Formation and locality. Hamilton group ; Alden, Erie county, N. Y 



Fexestella quadraxgula, n. sp. 



Bryozoan probably infundibuliform in shape though, so far as ob- 

 served, occurring only in small fragments; frond rigid in appearance. 



Branches slender, very gradually increasing in size to the bifurca- 

 tions which are distant from each other from five to fifteen millimetres, 

 generally from ten to twelve millimetres ; width of branches :rom .33 

 to nearly .50 mm. space between the branches more than the width of 

 the branches ; nine branches in tKe space of five millimetres ; on 

 non-poriferous side, branches rounded and frequently having a node 

 or spine opposite the dissepiments ; striated ; striae fine ; sometimes 

 entirely concealed by fine granules. 



Dissepiments slender, less than .25 mm. in width ; seven in the space 

 of five millimetres, expanding at their junction with the branches; on 

 non-poriferous side on a plane with the branches, rounding ; poriferous 

 side depressed, angular ; slightly carinated. 



Fenestrules broadly oval or sub-quadrangular; length from .50 to 

 .66 mm.; width from .33 to .50 mm. Cells are in two ranges, open- 

 ing slightly laterally ; apertures minute, .16 mm. in diameter, very 

 closely arranged ; distance apart about one-half the diameter of an 

 aperture ; twenty-two in the space of five millimetres ; margins 

 slightly elevated ; space between ranges of apertures, angular, cari- 

 nated ; carina moderately strong ; very slightly elevated and having 

 a row of nodes ; nodes moderately strong, about four in the space of 

 one millimetre. 



Formation and locality. Hamilton group ; Darien, 1ST. Y. 



«/ Fen"estella emaciata, n. sp. 



Bryozoan occurring only in fragments, the form of the whole frond 

 is not certainly known, but probably infundibuliform ; largest frag- 

 ment observed five centimetres long and three wide. 



Branches moderately slender ; not increasing in size, except just 

 below the bifurcations, which are distant from each other from four 

 to twenty-four millimetres — generally about fifteen millimetres ; width 



