TO Thirty-sixth Report ox the State Museum. 



Owing to the sub-cuneiform shape of the branches the fenestrules 

 of the poriferous and non-poriferous face present an entirely differ- 

 ent appearance ; on non-poriferous face they are broadly oval or sub- 

 quadrangular ; .66 mm. in length; width from .50 to .66 mm.; 

 on the poriferous side they frequently appear merely as narrow slits; 

 sometimes the branches are apparently contiguous. 



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

 circular, diameter about .20 mm., closely arranged; distance apart from 

 one-half to one diameter of an aperture, about twenty in the space of 

 five millimetres ; margin distinctly elevated and indenting the border 

 of the fenestrule ; space between ranges of apertures carinated ; carina 

 thin, slightly elevated and having prominent nodes or short spines, 

 two in the space of one millimetre. 



When both the poriferous and non-poriferous faces of this species 

 can be seen, it will be very easily distinguished from any other species 

 of this formation. 



Formation and locality. Hamilton group ; Moscow, Livingston 

 county, is". Y. 



Fexestella brevilixea, n. sp $<* F - £ * 0V ■ *« 



Bryozoan probably infundibuliform, largest fragment seen seven 

 centimetres wide and five long. 



Branches moderately strong, a transverse section sub- cuneiform in 

 outline — the widest portion on poriferous side — gradually increasing 

 in size to the bifurcations, which are distant from each other from 

 seven to twenty millimetres; width of branches from .33 to .66 mm.; 

 space between branches greater than the width of the branches, five 

 or six in the space of five millimetres; or when the dissepiments on 

 opposite sides of the branches alternate, which is generally the case, 

 the branches are sinuous ; on non-poriferous side rounding or slighty 

 angular, carinated ; carina thin, but slightly elevated, sinuous ; sur- 

 face pustulose. 



Dissepiments from .50 to .66 mm. in width, three in the space of 

 five millimetres on non-poriferous side, on a plane with the branches, 

 rounded, with a semi-circular carination ; 'pustulose. 



Fenestrules oval ; owing to the sub-cuneiform shape of the branches, 

 the fenestrules on poriferous and non -poriferous sides present a widely 

 different appearance; on non-poriferous side 1.33 mm. in length, 

 .50 mm. or slightly more in width; on poriferous side they appear 

 much smaller, both in regard to length and width. 



'Cells in two ranges minute, circular or lunate, opening slightly lat- 

 erally: diameter .20 or .16 mm.; space between the apertures longi- 

 tudinally, equal to or more than the diameter of an aperture ; ranges 

 of apertures separated by a carina, which is very much elevated; height 

 about .75 mm., or more than the thickness of the branch ; at the base 

 it is nearly .25 mm. in thickness, continuing of that thickness for about 

 one-third the height of the carina, where it abruptly narrows and for 

 the rest of the height the carina is extremely thin. Owing to the sud- 

 den contraction of the carina it appears to have a ridge upon the side 

 when viewed from above ; apparently the dissepiments sometimes have 



