. Bulletin - New York State Museum. Science. NIAGARA FALLS AND VICINITY 173 tions; zooecia subtubular, more or less oblique, radially arranged about a central axis and opening on all sides of the segments. Helopora fragilis Hall (Fig. 74) _,^__ __ (1852. Pal. N. Y. 2:44, pi. 18, fig. 3a-f) [ / . — } Distinguishing characters. Minute cylindric or clavate zoarium swollen at one end; oval or subangular pores, having a spiral direction around the stipe and arranged between longi- tudinal elevated lines. Found in the Clinton beds at Lock- port etc. (Hall). Probably occurs also at Niagara. Also
. Bulletin - New York State Museum. Science. NIAGARA FALLS AND VICINITY 173 tions; zooecia subtubular, more or less oblique, radially arranged about a central axis and opening on all sides of the segments. Helopora fragilis Hall (Fig. 74) _,^__ __ (1852. Pal. N. Y. 2:44, pi. 18, fig. 3a-f) [ / . — } Distinguishing characters. Minute cylindric or clavate zoarium swollen at one end; oval or subangular pores, having a spiral direction around the stipe and arranged between longi- tudinal elevated lines. Found in the Clinton beds at Lock- port etc. (Hall). Probably occurs also at Niagara. Also abundant in the thin calcareous upper Medina layers at Niagara (?). ^"-lajjafj. Fig. 74 Helopora fragilis natural size and enlarged Genus clathropora Hall [Ety.: clathri, a lattice; poms, a pore] Zoarium composed of anastomosing branches, forming a regular network with round or oval spaces or fenestrules, with a /. .i^* I'M /' Fig. 75 Clatliropora frondosa with portions of celluliferous face enlarged articulating base; the branches are made up of two layers grown to- gether back to back, and with the zooecial tubes opening on both sides of the frond; apertures usually subquadrate, arranged longi- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum; New York State Museum. Albany : New York State Education Dept
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