CORALS AND BRYOZOA . 
97 
IN TRAP ORA, Hall. 1881. 
Intrapora puteolata. 
PLATE XXIX, FIGS. 18-26. 
Intrapora puteolata, Hall. Trans. Albany Institute, vol. x, abstract, p. 16. 1881. 
“ “ “ Report of State Geologist for 1885, advance sheets. Expl. pi. 29, fig's. 18-26. 
18S6. 
Compare Stictoporella interstincta, Ulrich. Journal Cin. Soc. Nat. Hist., vol. v, No. 3, p. 169. PI. 8, figs. 
9, 9a. 18S5. 
Zoarium consisting of a flattened, dichotomously bifurcating or branching frond, 
arising from a spreading base; width of branches usually from 2 to 4 mm., 
but sometimes 20 mm. or more; greatest thickness 1 mm. Cells tubular, 
for one-half their length essentially parallel with the mesotheca, then turn¬ 
ing abruptly outward. Cell apertures oval, length a little more than .25 mm., 
width three-fourths the length; very closely and irregularly disposed, fre¬ 
quently in contact. Peristomes strong, slightly and equally elevated. Inter- 
apertural space occupied by minute angular pits, generally a single series 
between adjacent apertures On the non-celluliferous margin of the branch 
these pits are so disposed that their margins have the appearance of oblique 
striations. Intercellular space irregularly vesiculose. 
The surface of the broader forms of this species is very similar to that of 
Fistulipora interccllata. 
Formation and locality. Upper Helderberg group, Falls of the Ohio river. 
PRISMOPORA, Hall. 1881. 
Prismopora triquetra. 
PLATE XXVIII, FIGS. 8-10 ; and PLATE XXIX, FIGS. 9-15. 
Prismopora triquetra, Hall. Trans. Albany Institute, vol. x, abstract, p. 17. 1881. 1S83. 
“ “ “ Report of State Geologist for 1882. Expl. pi. 25, figs. 8-10. 
“ “ Report of State Geologist for 1S85, advance sheets. Expl. pi. 29, figs. 9-15. 
1886. 
Zoarium consisting of an irregular group of triangular branches, usually dichoto¬ 
mously bifurcating, sometimes trifurcating. Faces of the branch equal, 
width from 3 to 6 mm., concave, the concavity sub-angular along the middle, 
a comparatively wide space at the margin destitute of cell apertures; greatest 
