76 Forty-fourth Report on the State Museum. 



narrower form of the frond, the apertures not pustuliform and 

 much less conspicuous, the very oblique cell apertures of the 

 marginal rows, and the narrow non-celluliferous marginal space ; 

 from S. suhrigida, S. angularis, S. recta^ S. hifurcata, and S. rigida 

 and S. crescens of the Upper Helderberg group, it may be distin- 

 guished by the more numerous and much finer longitudinal 

 striations ; from S. incisurata it is distinguished by the narrower 

 form of the frond, more nearly parallel margins, smaller and more 

 indistinct cell apertures, finer and more numerous striations. 



Formation and locality. — Hamilton group, near Alden, Erie 

 county, N. Y. 



Stictopora angularie. 



Stictopora angularis^ Hall. Palaeontology of New York, vol. vi, p. 252, 



pi. Ixi, fig. 23, 1887. 



This species most closely resembles S. suhrigida, but the frond 

 is more decidedly subangular along the middle, the cell apertures 

 are more pustuliform, the longitudinal ridges are not so promi- 

 nent, the frond is wider, and the bifurcations are more frequent ; 

 from S. recta it may be distinguished by its somewhat -wider 

 branches, smaller more decidedly circular, and more prominently 

 pustuliform cell apertures, wider longitudinal ridges, and absence 

 of nodes or granules on the ridges ; from S. trilineata, it is distin- 

 guished by its somewhat narrower form, more frequent bifurca- 

 tions, smaller, pustuliform apertures, and the prominent longi- 

 tudinal ridges ; it resembles S. tumulosa in having pustuliform 

 cell apertures, but the apertures are smaller, and the ranges of 

 apertures are separated by prominent ridges ; in that species the 

 striations are more numerous, very slender and slightly elevated ; 

 from S. rigida and S. a^escens it is distinguished by its smaller, 

 circular, more distant, pustuliform cell apertures ; from S. crenu- 

 lata by the prominent ridges. 



Formation and locality. — Hamilton group, four miles south of 

 LeKoy, Genesee county, N. Y. 



