CORALS AND BRYOZOA. 
107 
Fenestella parallela. 
PLATE XLIV 7 , FIGS. 8-18. 
Fenestella ‘parallela, Hall. Trans. Albany Institute, vol. x, abstract, p. 26. 1881. 
“ “ “ Report of State Geologist for 1885. Expl. pi. 44, figs. 8-18. 1S86. 
Bryozoum infundibuliform; fronds large, of compact appearance. Branches 
very slender, width above a bifurcation .25 mm., increasing to .35 or .45 mm., 
angular, very gradually enlarging, essentially parallel. Bifurcations distant. 
Interstices of about the same width as the branches. Dissepiments slender, 
width .20 mm., angular, slightly depressed, eight in the space of 6 mm. 
Fenestrules oval, length .50 or .55 mm., width from .25 to .30 mm. 
On the celluliferous face the branches are angular. Dissepiments angular, 
carinated, depressed. Fenestrules of the same appearance as on the opposite 
face. Cell apertures in two ranges, sixteen in the space of 5 mm., separated 
by the diameter of an aperture. Surface between ranges of apertures cari¬ 
nated ; carinse slightly elevated, strong, frequently nodose, four nodes in the 
space of 1 mm. 
This species may be distinguished from F. granilinea by the two ranges of 
apertures and the smaller branches; from F. variopora, F. tenella, F. pertenuis 
F. latijunctura and F. orbirama, by the coarser appearance of the frond, the 
larger branches and less frequent dissepiments. 
Formation and locality. Upper Helderberg group, near Buffalo, N. Y. 
Fenestella curvijunctura. 
PLATE XLVI, FIGS. 1-5. 
Fenestella curvijunctura, Hall. Trans. Albany Institute, vol. x, abstract, p. 29. 1881. 
Bryozoum infundibuliform. Branches very slender, rounded, width above a bifur¬ 
cation, 16 mm., increasing to .25 or .30 mm. Interstices wider than the 
branches. Dissepiments slender, width from .16 to .18 mm., rounded, 
curved, on a plane with the branches, eleven in the space of 5 mm. Fenes¬ 
trules sub-quadrangular or oval, length from .25 to .30 mm., width usually 
slightly less than the length, but often equal to it. 
