100 TWENTT-SIXTH REPORT ON THE StATE MuSEUM. 



ing upwards and outwards. The surface of the frond is marked with 

 distant, elevated spots or nebulse, formed of cells which are a very 

 little larger than the rest. Thickness of frond four-hnndredths of an 

 inch, width nearly half kn inch ; eleven of the longitudinal ranges of 

 cells in the width of one-tenth of an inch and about eight pores in 

 the same length. 



This species differs from E. tenuis in its greater breadth, its nebu- 

 lose surface and the proportionally shorter cell apertures, as well as 

 in its more robust appearance. 



Formation and locality. — In weathered blocks of the Lower Hel- 

 derberg group, at Catskill creek, New York. 



ESCHAROPOEA LIRATA n. Sp. 



Bryozoum forming small ensiform bodies, gradually enlarging 

 upwards from an obtusely pointed base ; sides of the stipe convex, 

 giving a lenticular transverse section. Cells in longitudinal parallel 

 rows increasing in size with the width of the stipe : longitudinal 

 partitions elevated (giving a lirate aspect to the surface), transverse 

 partitions thin, deeply depressed. Cell apertures quadrangular, 

 longer than wide. Length of stipe from half to three-fourths of an 

 inch, greatest width about one-sixteenth of an inch, containing about 

 eight rows of pores. 



These forms may perhaps be only the bases, or young, of K tenuis, 

 the bases of that species having not been found with the specimens ; 

 but the objection to such a supposition is that these forms are not 

 known to occur in the same strata where the others are most abundant, 

 and are most common in beds from a higher level. They resemble 

 the F. {P/icenopora) ensiformis of the Clinton group. 



Formation and locality. — In the upper, shaly portions of the 

 shaly limestones of the Lower Helderberg group, near Clarksville, 

 New York. 



Genus CALLOPOKA Ball 



Callopora Hyale n. sjp. 

 Bryozoum growing in irregular foliate expansions, or incrusting 

 other bodies. ■ Surface marked by comparatively large, distant and 

 irregularly disposed, circular or slightly oval cells with elevated 

 margins. The intercellular spaces marked by very small, shallow, 

 angular pits or depressions, sometimes three or four between adja- 

 cent cells ; sometimes considerable areas destitute of these depressions, 

 when the specimen presents much the appearance of a Trematopora. 



