254 PALEONTOLOGY OF NEW YORK. 



length of an aperture; five or six ranges on each face of the branch. The 

 apertures of the marginal ranges are a little larger and more prominent th.an 

 the others. Rows sep.arated by prominent granulose or nodulose ridges, which 

 have a width equal to that of the cell apertures ; granules numerous, irregu- 

 larly disposed. The ridges frequently partially obscure the apertures. 



Formation and locality. Hamilton group, West Hamburg, Erie county, N. Y. 



Stictopora bifurcata, n. sp. 



PLATE LXni, KIG. 17. ' 



ZoARiUM consisting of a flattened, dichotomously branched frond, proceeding from 

 a spreading base. Branches from 1 to about 1.50 mm. in width, with the 

 margins sub-parallel, only slightly expanding before bifurcation ; non- 

 celluliferous marginal space very narrow or obsolete ; transverse section len- 

 ticular, greatest thickness a little less than .50 mm. ; bifurcations frequent, 

 sometimes occurring at intervals of 3 mm ; from the frequency of the bifur- 

 cations the branches have occasionally the appearance of trifurcating. Cells 

 tubular, opening directly outward. Intercellular tissue vesiculose, vesicles 

 irregularly disposed. Cell apertures oval, length about .20 mm., width about 

 one-half the length, disposed in longitudinal sub-parallel rows, from five to 

 seven rows on a branch ; apertures of the marginal rows a little larger than 

 the others, having a length of .25 mm. Peristomes thin, the posterior por- 

 tion a little the more strongly elevated, but not denticulated on the specimens 

 observed. Ranges of apertures separated by prominent, moderately strong, 

 nodose ridges, which frequently very much obscure the cell .apertures ; nodes 

 small, regularly distant, about twenty in the space of 5 mm. 



********* 



Formation and locality. Hamilton group, near Muttonville, North Bristol 

 township, Ontario county, N. Y. 



