102 
PALAEONTOLOGY OF NEW YORK . 
branch. Cell apertures minute, circular, diameter .15 mm. Ranges of aper¬ 
tures separated bj a prominent sinuous carina. 
This species may be distinguished from the others by the prominent sinuous 
carina 
Formation and locality. Upper Helderberg group, near Buffalo, N. Y. 
Glauconome tenuistriata. 
PLATE XXXIII, FIGS. 15-19. 
Glauconome tenuistriata, Hall. Trans. Albany Institute, vol. x, abstract, p. 19. 1SS1. 
“ “ “ Report of State Geologist for 18S2. Expl. pi. 26, figs. 15-19. 1SS3. 
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. 13, 14. 
Glauconome nodata. Hall. Trans. Albany Institute, Vol. v, abstract, p. 18. 1881. 
“ “ “ Report of State Geologist for 18S2. 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-cell uliferous 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. 
