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PALEONTOLOGY OF NEW YORK. 
Stictopora crenulata. 
PLATE LX, FIG. 22. 
Stictopora crenulata. Hall. Report of State Geologist for 1883, p. 44. 1884. 
Zoarium consisting of a flattened, frequently sinuous, dichotomously branched 
frond, arising from a base composed of several rootlets attached to foreign 
bodies; the frond for a little more than 1 mm above the base is sub¬ 
elliptical in section, striated, non-celluliferous, then becoming flattened. 
Branches about 1.50 mm. wide; non-celluliferous marginal space very 
narrow, width .25 mm.; margins essentially parallel, frequently crenulated, 
the branches scarcely expanding before bifurcation; transverse section len¬ 
ticular, abruptly contracting near the margin, the angles very acute, the 
remaining portion regularly convex; bifurcations comparatively distant; 
branches widely diverging. Intercellular tissue consisting of irregularly 
disposed vesicles. Cell apertures a little oblique, circular, diameter about 
.18 mm., arranged in parallel longitudinal rows, separated by about twice 
the diameter of an aperture, usually five or six rows on a branch; the 
apertures of the marginal rows are larger than the others and more oblique, 
the upper portion of the cell walls frequently being exposed for a distance 
equal to twice the diameter of an aperture. In the central ranges there 
are fifteen apertures in the space of 5 mm., in the outer ranges nine or ten 
in the same space; opposite each of these cells the margin is extended, 
giving to it a crenulated appearance. Peristomes thin, nearly equally 
elevated, the posterior portion being slightly the more prominent. Space 
between the ranges of apertures flat or slightly convex, striated, generally 
three thin, angular striations between adjacent rows of apertures. 
Formation and locality. Hamilton group, near Alden, Erie county, N. Y. 
Stictopora angularis, n. sp. 
PLATE LXI, FIG. 23. 
Zoarium consisting of a flattened dichotomously branched frond, arising from a 
spreading base. Branches from 2 to 2.50 mm. in width: margins essentially 
