CORALS AND BRYOZOA. 
241 
cular in form. The cells immediately adjacent to these have an indistinct 
radiation from them and are larger than the others. 
The surface has a very close resemblance to Ceramopora (L.) foliacea, but the 
cell apertures are smaller, the maculae more elongate-oval, and the frond is cellu- 
liferous on each face. From similar forms of the Niagara group this one may 
be distinguished by the elongate depressed maculae. This is the only species of 
the genus at present known from any formation above the Niagara horizon. 
Formation and localities. Hamilton group, Spurgen’s Glen, Norton’s Landing, 
Cayuga Lake and Darien Centre, N. Y. 
STICTOPORA, Hall. 1847. 
(See pages 37 and 90.) 
STICTOPORA INCISURATA. 
PLATE LX, FIGS. 1-18. 
Slictopora incmiratci, Hall. Trans. Albany Institute, vol. x, p. 189. 1881. 
“ “ “ Report of State Geologist for 1883, p. 3S. 1884. 
Stictopora indenta, Hall. Trans. Albany Institute, vol. x, p. 189. 1S81. 
“ “ “ Report of State Geologist for 1883, p. 40. 1S83. 
Stictopora obliqua, Hall. Trans. Albany Institute, vol. x, p. 1S9. 1SS1. 
“ “ “ Report of State Geologist for 1883, p. 39. 1884. 
Stictopora multipora, Hall. Trans. Albany Institute, vol. x, p. 190. 1881. 
“ “ “ Report of State Geologist for 1883, p. 43. 1884. 
Zoarium consisting of a flattened, dichotomously branched frond, proceeding 
from a spreading base; distal extremities of branches obtuse; transverse 
section varying from narrow lenticular to acutely oval. Branches varying 
from 2 to nearly 6 mm. in width, margins slightly diverging, frequently 
almost parallel, thickness from .50 to 1 mm.; width of noncelluliferous 
space at margin usually less than .50 mm. On some fronds the bifurcations 
are frequent, occurring at intervals of from 7 to 10 mm., but usually they 
are more distant, and often a branch continues, without bifurcating, for 30 
or 40 mm., and rarely even more. Mesotheca thin, with sharp, divergent, 
longitudinal striations, caused by the recumbent portion of the cell tubes, 
and strong, arching undulations of growth. Cells tubular, recumbent for 
the greater portion of their length, then turning abruptly outward, opening 
