104 
PALAEONTOLOGY OF NEW YORK. 
THAMNISCUS, King. 1849. 
Thamniscus multiramus. 
PLATE XXXIII, FIGS. 1-5. 
Thamniscus multiramus, Hall. Trans. Albany Institute, vol. x, abstract, p. 19. 1S81. 
“ “ “ Report of State Geologist for 1882. Exp 1. pi. 26, figs. 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 carince with numerous 
nodes. 
Fenestella variapora. 
PLATE XLV, FIGS. 1-13; AND PLATE XXXV, FIG. 17. 
Fenestella variapora, Hall. Trans. Albany Institute, vol. x, abstract, page 28. 1881. 
“ “ “ Report of State Geologist for 1885. advance sheets. Expl. pi. 45, figs. 1-13. 
1886. 
“ patellifera, Ulricil Cont. Am. Pal., p. 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 nun. Fenestrules oval or subquadrangular, sometimes 
circular, length generally from .25 to .30 mm., width from .18 to .30 mm. 
