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 Le Roy, Genesee county, N. Y. 



LiCUENALIA 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, genierally 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 LeRoy, Genesee 

 county, N. Y. 



