204 
PALEONTOLOGY OF NEW YORK. 
smaller cell apertures, their trilobate form and the more prominent denticula- 
tions, the resemblance however is frequently very close: from other species 
it is distinguished by the small apertures, prominent denticulations and convex, 
granulose, inter-apertural surface. 
Formation and localities. Hamilton group, near York, Livingston county, and 
four miles south of Lc Hoy, Genesee county, N. Y. 
Liciienalia confusa, n. sp. 
NOT FIGURED. 
Zoarium consisting of thin explanate fronds incrusting other objects, usually 
Cyathophylloid corals; greatest thickness less than 1 mm., though fronds 
of nearly 90 mm. in diameter have been examined. Cells tubular, 
cylindrical. Intercellular space vesiculose, vesicles irregularly disposed. 
Cell apertures circular, broadly oval or sub-triangular, diameter .33 mm., 
very closely and usually irregularly disposed, generally in contact and sub¬ 
imbricating. Peristomes moderately thick, the posterior portion the more 
strongly elevated; the peristomes of adjacent apertures are frequently in 
contact and coalesce, the frond then presenting a regularly reticulate 
appearance; and when in contact, but not coalescing, the frond often 
presents a festooned appearance; when the peristomes are not in contact, a 
condition seldom occurring, the inter-apertural space is smooth. Surface 
marked by slightly elevated, closely disposed monticules, the apertures 
nearest their centers radiate from them, are less closely disposed, slightly 
larger and more oblique than the others. 
This species will be easily distinguished from the others by the crowded 
cell apertures, and the festooned or reticulate appearance of the surface of 
the frond. 
Formation and locality. Hamilton group, four miles south of Le Roy, Genesee 
county, N. Y. 
