CORALS AND BRYOZOA. 
253 
parallel, scarcely expanding before bifurcating; transverse section lenticular, 
sub-angular at the middle, somewhat abruptly contracting near the margins; 
angles very acute; non-celluliferous marginal space about .33 mm. in width; 
bifurcations occurring at intervals of from 5 to 7 mm. on the speci¬ 
mens observed; branches diverging at an angle of about forty-five degrees. 
Cells tubular, for part of their length recumbent, then abruptly curving 
and opening directly outward. Intercellular space occupied by irregularly 
disposed vesicles. Cell apertures circular or very broadly oval, pustuliform; 
disposed in nearly parallel longitudinal rows, and separated by two or three 
times the diameter of an aperture; at the center of the branch they have a 
diameter of about .15 mm., those of the marginal rows are larger, having a 
diameter of about .22 mm.; diameter of the pustules .25 mm., increasing to 
.35 mm. Peristomes thin, very slightly elevated. Ranges of apertures 
separated by prominent, rounded ridges, having a width equal to or greater 
than the diameter of an aperture, and elevated equally with the pustules. 
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Formation and locality. Hamilton group, four miles south of Le Roy, Genesee 
county, N. Y. 
Stictopora recta, n. sp. 
NOT FIGURED. 
Zoarium consisting of a flattened dichotomously branched frond. Branches 
from 1 to 1.25 mm. in width, margins parallel, the branches not expanding- 
before bifurcating; transverse section lenticular, abruptly contracting near 
the margins, greatest thickness .33 mm.; non-celluliferous space at the mar¬ 
gin very narrow or obsolete; bifurcations comparatively distant, occurring 
at intervals of about 6 mm. on the specimens observed; branches diverging 
at an angle of forty-five degrees. Cells tubular, arising very obliquely from 
the mesotheca, abruptly curving and opening directly outward. Intercellular 
tissue vesiculose, vesicles irregularly disposed. Cell apertures oval, length 
about .18 mm., or slightly less, width a little more than one-half the length; 
regularly disposed in parallel longitudinal rows, separated by less than the 
