102 PALEONTOLOGY OF NEW YORK. 



branch. Cell apertures minute, circular, diameter .15 mm. Ranges of aper- 

 tures separated by a prominent sinuous carina. 



This species may be distinguished from the others by the prominent sinuous 

 carina 



Formation and localiUj. Upper Helderberg group, near Buffalo, N. Y. 



Glauconome tenuistkiata. 



PLATE XXXin, FIGS. 15-19. 



Olomocmome tenuislrlata. Hall. Ti-ans. Albany Institute, vol. x, abstract, p. 19. 1881. 



« " " Report of State Geologist for 1882. Expl. pi. 26, figs. 15-19. 1883. 



Width of main stipe .60 mm., of lateral branches .33 mm. ; transverse section 

 broadly oval ; space between lateral branches about twice the width of a 

 branch. Non-celluliferous face of frond gently rounded and finely striated; 

 celluliferous face angular. Cell apertures circular, diameter .20 mm., three 

 in the space of 1.15 mm. Peristomes distinctly and equally elevated. Sur- 

 face between ranges of apertures carinated, carina slight. 



This species may be distinguished from G. sinuosa and G. nodata by the 

 greater space between the lateral branches. 



Formation and locality. Upper Helderberg group, near Buffalo, N. Y. 



Glauconome nodata. 



PLATE XXXIII, FIGS. 18, U. 



Qlauconome nodata. Hall. Trans. Albany Institute, Vol. v, abstract, p. 18. 1881. 



" " " Report of State Geologrist for 1882. Expl. pi. 26, figs. 13, 14. 



Width of stipe .60 mm., of lateral branches .30 mm. ; transverse section 

 broadly oval. Space between lateral branches equal to the width of a 

 branch. Non-celluliferous face gently rounded, finely striated. Cell aper- 

 tures circular, opening laterally ; separated more than the diameter of an 

 aperture ; fifteen in the space of five mm. Surface between ranges of aper- 

 tures elevated with prominent nodes. 



