254 
PALAEONTOLOGY OF NEW YORK. 
length of an aperture; five or six ranges on each face of the branch. The 
apertures of the marginal ranges are a little larger and more prominent than 
the others. Rows separated by prominent granulose or nodulose ridges, which 
have a width equal to that of the cell apertures; granules numerous, irregu¬ 
larly disposed. The ridges frequently partially obscure the apertures. 
■Ai. -V_ -Y- -V- -V- AL- -V- AA, 
-7v'WW'A''VV'Vv-W'7r'7V‘ 
Formation and locality. Hamilton group, West Hamburg, Erie county, N. Y. 
Stictopora bifurcata, n. sp. 
PLATE LXIII, FIG. 17. 
Zoarium consisting of a flattened, dichotomously branched frond, proceeding from 
a spreading base. Branches from 1 to about 1.50 mm. in width, with the 
margins sub-parallel, only slightly expanding before bifurcation; non- 
celluliferous marginal space very narrow or obsolete; transverse section len¬ 
ticular, greatest thickness a little less than .50 mm.; bifurcations frequent, 
sometimes occurring at intervals of 3 mm ; from the frequency of the bifur¬ 
cations the branches have occasionally the appearance of trifurcating. Cells 
tubular, opening directly outward. Intercellular tissue vesiculose, vesicles 
irregularly disposed. Cell apertures oval, length about .20 mm., width about 
one-half the length, disposed in longitudinal sub-parallel rows, from five to 
seven rows on a branch ; apertures of the marginal rows a little larger than 
the others, having a length of .25 mm. Peristomes thin, the posterior por¬ 
tion a little the more strongly elevated, but not denticulated on the specimens 
observed. Ranges of apertures separated by prominent, moderately strong, 
nodose ridges, which frequently very much obscure the cell apertures ; nodes 
small, regularly distant, about twenty in the space of 5 mm. 
aa, at, -V- A/- A/- -V- A/, -V- AA, 
'A~ *7V "A' "TV "A" *75* '/y- "A~ 
Formation and locality. Hamilton group, near Muttonville, North Bristol 
township, Ontario county, N. Y. 
