68 FORTY-FOURTB REPORT ON THE StATE MuSEUM. 



larly disposed ; at other times forming intersecting rows, the sur- 

 face of the frond presenting a somewhat regularly reticulated 

 appearance. Interstitial cells about equal in number to the larger 

 ones, diameter .8 mm. usually quadrangular, square or oblong, the 

 shape and size varying according to the width of the adjacent sides 

 of the large cells. Surface marked by broad, slightly elevated 

 monticules, the centers of which are distant about 3.50 mm. ; and 

 have a space about 1.50 mm. in diameter occupied by larger cells 

 of .45 mm. in diameter. The summits of the cell walls have 

 frequently short triangular spinules, usually occurring at the 

 angles, but sometimes on other portions of the walls. 



This species closely resembles P. reticulata, but the cell walls 

 are thinner, the cells are smaller, and the interstitial cells are 

 much more frequent ; from P. pertenuis it is distinguished by the 

 thinner cell walls, the more closely disposed maculae and the 

 more decidedly polygonal form of the cells ; from P. varicella 

 by the smaller cells, more closely disposed monticules, and 

 the presence of interstitial cells ; from P. amplectens by the larger 

 size of the cells ; from P. incrustans of the Lower Helderberg 

 group, by the thinner cell walls, the smaller cells, more numer- 

 ous interstitial cells, with larger cells on the monticules. 



Formation and locality. — Hamilton group, York, Livingston 

 county, N. T. 



Palescliara reticulata. 



Paleschara reticulata. Hall, Trans. Albany Institute, vol. x, p. 179, 1881. 



*' Report of State Geologist for 1883, p. 6, U384. 

 '* " *' Palaeontology of New York, vol. vi, p. 237. 



, Not figured, 1887. 



Zoarium, consisting of extremely thin foliaceous expansions 

 incrusting other bodies, greatest thickness observed .33 mm. 

 Cells usually pentagonal or hexagonal, sometimes quadrangular, 

 diameter .35 mm., in contact; usually irregularly disposed, but 

 sometimes arranged in undulating intersecting rows, and generally, 

 when so disposed, the cells are quadrangular, giving to the sur- 

 face a somewhat regularly reticulate appearance. Interstitial 

 cells minute and on some of the fronds very infrequent. Surface 

 marked by maculae, the centers of which are distant 4 or 5 mm., 

 with a central space 1.50 mm. in diameter, occupied by larger 



