CORALS AND BRYOZOA. 
103 
This species may be distinguished from G. sinuosa by its more slender form 
and the absence of a carinae, and from G. temistriota by the much closer 
arrangement of the lateral branches. 
Formation and locality. Upper Helderberg group, near Le Roy, Genessee 
county, N. Y. 
CRISINELLA, Hall. 1883. 
Crisinella scrobiculata. 
PLATE XXXIII, FIGS. 6-8. 
Crisina? scrobiculata, Hall. Trans. Albany Institute, vol. x, abstract, p. 20. 1881. 
Crisinella “ “ Report of State Geologist for 1882. Expl. pi. 26, fig's. 6-8. 1888. 
Zoarium ramose, solid, celluliferous on one face, diameter 1 mm.; transverse 
section circular. Cell apertures circular, diameter 25 mm.; disposed in 
oblique ascending rows from the center to the margins of the branch; the 
two series of rows alternating at the center. Space between the rows equal 
to twice the diameter of an aperture. Peristomes strong, distinctly and 
equally elevated. Interapertural space occupied by large polygonal pits. 
Non-celluliferous face of frond finely and irregularly striated. 
Formation and locality . Upper Helderberg group, Western New York. 
CYSTOPORA, Hall. 1881. 
Cystopora geniculata. 
PLATE LX VI, FIGS. 7, 8. 
Cystopora geniculata, Hall. Trans. Albany Institute, vol. x, abstract, p. 20. 1881. 
Zoarium consisting of a cylindrical aggregation of tubular cells ; length of cells 
2 mm.; width when first exposed .33 mm., increasing to .50 mm., then con¬ 
tracting, having a diameter at the apertures of .28 mm. Cells alternating, 
imbricating and forming spiral rows. 
Formation and locality. Upper Helderberg group, Falls of the Ohio river. 
