130 
PALEONTOLOGY OF NEW YORK. 
Fenestella perplexa. 
NOT FIGURED. 
Fenestella (Heinitrypa) perplexa, Haul. Trans. Albany Institute, vol. x, abstract, p. 33. 18S1. 
“ btgeneris, Ulrich. Cont. Am. Pal., vol. i, No. I, p. 11, pi. 2, figs. 1, la. 
Bryozoum infundibuliform. Branches slender, width above a bifurcation usually 
from .20 to .25 mm., increasing to .35 or .40 nun., usually straight, some¬ 
times irregular, rounded, nodose; nodes small, irregularly disposed; transverse 
section of branch cuneiform, width .25 to .40 min., depth 1.25 mm. Inter¬ 
stices of about the same width as the branches. Dissepiments slender, width 
.25 mm., depth 1 mm., rounded, on a plane with the branches or elevated 
above, sometimes continuing across the branch and coalescing with adjacent 
dissepiments, forming very irregular transverse ridges, seven in the space 
of 5 mm. Fenestrules oval, length .45 mm., width about .25 mm. 
On the celluliferous face the dissepiments are angular, carinated, the carinse 
extending upon the branch and to the summit of the carina of the branch. 
Fenestrules narrower than on the opposite face. Cell apertures in two ran¬ 
ges, opening laterally, twenty in the space of 5 mm., separated by less than 
the diameter of an aperture. Branches carinated; carinse thin, height.25 mm., 
and having, on the summit, a row of irregular nodes, which extend beyond 
the carina) and have precisely the appearance as if they had been originally 
extended and connected adjacent carinse forming seal*, which had been 
broken away, leaving only the attached portions; twenty in the space of 
5 mm. 
This species may be very easily distinguished, by the peculiar appearance ot 
the summit of the carina. 
Formation and locality. Upper Helderberg group, Falls of the Ohio river. 
