CORALS AND BRYOZOA. 
203 
other at present known, except L. colliculata, and it may be distinguished from 
that species by the somewhat larger cell apertures, greater prominence of the 
features above mentioned, and the larger vesicles. 
Formation and localities. Hamilton group, Fall brook, four miles east of Can¬ 
andaigua lake, and near York, Livingston county, N. Y. 
Lichenalia cornuta, n. sp. 
NOT FIGURED. 
Zoarium consisting of explanate fronds, incrusting other objects, generally 
Cyathophylloid corals, having an observed thickness of about 1 mm. Cells 
tubular, septa obsolete. Intercellular tissue composed of vesicles, which are 
sometimes irregularly disposed, at other times regularly superimposed. Cell 
apertures circular or trilobate, oblique, subimbricating, diameter .30 mm., 
very closely disposed, radiating from the monticules and forming diagonally 
intersecting lines, frequently in quincunx order. Peristomes thin, slightly 
elevated, often scarcely perceptible, and having on one side a prominent 
crescentiforin projection, the extremities of which are prolonged into den- 
ticulations, which in course of growth form two parallel striations along 
the inner surface of the cell tube. Interapertural space slightly convex and 
minutely granulose. Surface marked by monticules, the centers of which 
are distant between 4 and 5 mm., arranged in sub-regular intersecting rows; 
the center of the monticules are convex, minutely granulose, and destitute 
of cell apertures for the space of 1.50 mm., the apertures immediately 
adjacent are sometimes very slightly larger than those on other portions of 
the frond. When the frond is worn or macerated, the interapertural space 
is flattened, the granules are obsolete, leaving very minute, angular pits in 
their place; in this condition it has but a slight resemblance to a perfectly 
preserved frond. 
This species may be distinguished from Fistulipora constrida by the smaller 
cell apertures, more prominent denticulations, and the granulose inter-apertural 
space; from F. ram.osa by the manner of growth, being incrusting only, the 
