248 
PALEONTOLOGY OF NEW YORK . 
Branches 2 mm. in width, diverging at an angle of forty-five degrees; 
margins essentially parallel; non-celluliferous marginal space very narrow 
or obsolete; transverse section lenticular, greatest thickness observed a 
little less than 1 mm. Cells tubular, arising very obliquely from the 
mesotheca. Inter-cellular space occupied by irregularly disposed vesicles. 
Cell apertures broadly oval, often nearly circular, length .25 mm., disposed 
in sub-regular longitudinal lines, sometimes alternating and forming obliquely 
transverse rows, six apertures in the space of 5 mm. measured longitudi¬ 
nally ; apertures of the marginal rows slightly larger and more distant than 
the others. Peristomes strong, posterior portion the more elevated. Aper¬ 
tures separated by sinuous, interrupted longitudinal ridges, which are elevated 
equally with the peristomes. 
-V, -V- -V- -V- .aa, -v. .v, .AA, 
wwww'/rwwww 
Formation and locality. Hamilton group, south of Auburn, shore of Cayuga 
lake, N. Y. 
Stictopora ovata, n. sp. 
PLATE LXIII, FIG. 24. 
Zoarium consisting of a flattened dichotomously branched frond, proceeding 
from a spreading base; branches about 3.50 mm. in width; margins paral¬ 
lel, not expanding before bifurcating; non-celluliferous margin narrow, 
Avidtli less than .40 mm.; transverse section of the branch broadly lenticular 
or somewhat acutely oval, greatest thickness about 1.30 mm.; bifurcations 
comparatively distant, some of the branches continuing 25 mm. or more 
without bifurcating; bifurcations diverging at an angle of from thirty to 
forty-five degrees. Cells tubular, short, arising obliquely from the mesotheca, 
curving and opening directly outward, gradually enlarging to the aperture. 
Inter-cellular tissue consisting of irregularly disposed vesicles. Cell aper¬ 
tures broadly ovate, the broader end toward the base of the frond, length 
.35 mm., width three-fourths the length, regularly disposed in parallel 
longitudinal rows, frequently alternating and forming oblique transverse rows; 
longitudinally distant from .30 to .50 mm.; transversely they are separated 
