I 



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. 



Siietopora incUmrata, Hall. Trans. Albany Institute, vol. x, p. 189. 1881. 



" Report of State Geologist for 1883, p. 38. 18S4. 

 Stictopora indenta. Hall. Trans. Albany Institute, vol. x, p. 189. 1881. 



" " " Report of State Geologist for 1883, p. 40. 1883. 



Stictopora obliqua. Hall. Trans. Albany Institute, vol. x, p. 189. 1881. 



" " " Report of State Geologist for 1883, p. 39. 1884. 



Stictopora muUijtora, Hall. Trans. Albany Institute, vol. x, p. 190. 1881. 

 " " " Report of State Geologist foi- 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 pcarallel, thickness from .50 to 1 mm. ; width of noncellulifcrous 

 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 



