CORALS AND BRYOZOA. 107 



Fenestella parallela. 



PLATE XLIV, FIGS. &-18. 



Fenestella parallfla. Hall. Ti-ans. Albany Institute, vol. x, abstract, p. 26. 1881. 



" " " Report of State Geologist for 1885. Expl. pi. 44, figs. 8-18. 1886. 



Bryozodm 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., Avidth 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 ; carinas 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. latijundura and F. orbirama, by the coarser appearance of the frond, the 

 larger branches and less frequent dissepiments. 



Formalion and locality. Upper Helderberg group, near Buffalo, N. Y. 



Fenestella cdrvijunctura. 



PLATE XLTl, FIGS. 1-5. 

 Fenestella ewrvljunctura. Hall. Trans. Albany Institute, vol. x, abstract, p. 29. 1881. 



Beyozoum 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. 



