104 PALEONTOLOGY OF NEW YORK. 



THAMNISCUS, King. 1849. 



TUAMNISCOS MULTIRAMUS. 



PLATE XXXm, FIGS: 1-5. 



Thamniscns multiramtts. Hall. Tratin. Albany Institute, vol. x, abati-act, p. 19. 1S81. 



" " " Report of State Geolog-ist for 1S82. Expl. pi. 26, tig-s. 1-5. 1883. 



ZoARiUM fruticose, several stems arising from a common base, with frequent 



bifurcations and numerous lateral branches ; width of main branches about 



1.50 mm., of lateral branches less than 1 mm. ; transverse section circular. 



Frond celluliferous on one face. Cells tubular, length from 1 to 1.50 mm. ; 



for the greater portion of their length procumbent, near the aperture abruptly 



turning and opening directly outward. Apertures circular, diameter .40 mm. 



Non-celluliferous face finely striated. 



Formation and locality. Upper Helderberg group, Schoharie, Schoharie county, 



N Y. 



FENESTELLA, (Miller) Lonsdale. 1839. 



A. Species with two rows of cell apertures on the branch. 

 a. Forms having either a simple row of nodes, or slightly elevated carina with numerous 



nodes. 

 Fenestella variapora. 



plate XLV, figs. 1-13; AMU PLATE XXXV, FIG. 17. 



FenaiteUa variapora. Hall. Trans. Albany Institute, vol. x, abstract, page 28. 1881. 



" " " Repoi't of State Geologist for 1885, advance sheets. Expl. pi. 45, figs. 1-13. 



1886. 

 pateUifera. Ulrich. Cent. Am. Pal., \>. 8, pi. 1, fig. 1. May, 1886. 



Bryozoum infundibuliform, of compact appearance. Branches very slender, 

 width just above a bifurcation, .18 to .20 mm., increasing to .25 mm., 

 usually straight, but sometimes zigzag, rounded or slightly angular, smooth 

 in the specimens observed. Interstices usually of about the same width as 

 the branches. Dissepiments comparatively strong, width from .20 to .25 

 mm., rounded, on a plane with the branches or elevated above them, some- 

 times connecting with those of adjacent branches, forming continuous, irreg- 

 ular elevations, which are more prominent than the branches themselves ; 

 ten in the space of 5 mm. Fenestrules oval or subquadrangular, sometimes 

 circular, length generally from .25 to .30 mm., width from .18 to .30 mm. 



