. Bulletin of the Buffalo Society of Natural Sciences. Natural history; 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) ' _,.â ._ (1852. Pal. N. Y. 2:44, pi. 18, fig. 3a-f) h â. Distinguishing characters. Minute cylindric or clavate zoarium swollen ⢠-â at one end; oval or subangular pores, having a spiral direction around the jf \ stipe and arranged between longi- tudinal elevated 1ine<; FiS- 74 Helopora fragilis natural size L a ^ cvcl
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; 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) ' _,.â ._ (1852. Pal. N. Y. 2:44, pi. 18, fig. 3a-f) h â. Distinguishing characters. Minute cylindric or clavate zoarium swollen ⢠-â at one end; oval or subangular pores, having a spiral direction around the jf \ stipe and arranged between longi- tudinal elevated 1ine<; FiS- 74 Helopora fragilis natural size L a ^ cvclLtu lines. and enlarged 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 (?). Genus clathropora Hall [Ety.: clathri, a lattice; porus, a pore] Zoarium composed of anastomosing branches, forming a regular network with round or oval spaces or fenestrules, with a pointed,. W~r - â â ";\ J:~. Fig. 75 Clathropora 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 Buffalo Society of Natural Sciences. Buffalo, N. Y. : Buffalo Society of Natural Sciences
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