CORALS AND BRYOZOA. 
27 
the base of each aperture there is usually a spinule. Mesopores minute, 
elongate, the length often being from two to three times the width, so dis¬ 
posed that the margins give to the surface a finely striated appearance. 
This species may be distinguished from C. unispina by the elongate cell aper¬ 
tures and mesopores, and the striated appearance of the surface. 
Formation and localities. In the shaly limestone of the Lower Helderberg 
group, on Catskill creek, Greene county, and near Clarksville, Albany county, 
N. Y. 
Callopora (Callotrypa) oculifera. 
PLATE XIII, FIG 10; AND PLATE XXIII, FIG. 6. 
Callopora oculifera, Hall. Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 155. 1879. 
“ “ “ Report of State Geologist for 1882. Expl pi. 18, tig. 10. 
Zoarium ramose, solid, diameter of branches 1 mm. Cell apertures broadly 
oval, length .33 mm., width about three-fourths the length; more or less 
regularly disposed in longitudinal rows; seventeen in the space of five mm.: 
margins thin, distinctly elevated. Mesopores minute, angular: margins 
equal in height to those of the cell apertures. 
This species may be distinguished by the large broadly oval apertures, 
arranged in longitudinal lines, and the minute mesopores. 
Formation and locality. Lower Helderberg group, near Clarksville, N. Y. 
FISTULIPORA, McCoy. 1849. 
Fistulipora ponderosa. 
PLATE XIV, FIGS. 9-12; AND PLATE XXIII A, FIGS. 8-10. 
Callopora ponderom, Hall. Twenty-sixth Rep. N. Y. State Mus. Nat. Hist., p. 103. 1874. 
“ “ “ Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 156. 1S79. 
“ “ “ Report of State Geologist for 1882. Expl. pi. 14, figs. 9-12. 1883. 
Zoarium consisting of explanate fronds (?) of irregular, contorted growth, 
generally massive from the superimposition of successive layers of growth. 
Thickness of frond (?) varying from 1 to 5 mm., or more. Under surface 
