. Bulletin - New York State Museum. Science. NIAGARA FALLS xVND VICINITY 191 valves in some specimens; surface marked only by concentric lines of growth, which are strongest in old Fig. 103 Pentamerus oblongus Found in the upper crystalline Clinton limestone at Niagara (i specimen). The species is characteristic of the lower Clinton limestone, east of Lockport. Genus barrandella Hall & Clarke [Ety.: proper name] (Hall & Clarke. 1894. Pal. N. Y. v. 8, pt 2, p. 241, 243) Small pentameroid shells, of a galeate form or helmet-shaped con- tour, with a smooth, or rarely plicated sur
. Bulletin - New York State Museum. Science. NIAGARA FALLS xVND VICINITY 191 valves in some specimens; surface marked only by concentric lines of growth, which are strongest in old Fig. 103 Pentamerus oblongus Found in the upper crystalline Clinton limestone at Niagara (i specimen). The species is characteristic of the lower Clinton limestone, east of Lockport. Genus barrandella Hall & Clarke [Ety.: proper name] (Hall & Clarke. 1894. Pal. N. Y. v. 8, pt 2, p. 241, 243) Small pentameroid shells, of a galeate form or helmet-shaped con- tour, with a smooth, or rarely plicated surface. A spondylium is present, but is not supported by a septum. Barrandella fornicata (Hall) (Fig. 104). Pentamerus f o r n i c a t u s Hall (Fal. A^ F. 2:8i, pi. 24) . ^ ,^ Disfino-uishino; characters. Helmet- ^- shaped contour, very convex pedicle valve, w^ith overarching beak; sur- face obscurely plicate longitudinally. Found in the upper crystalline Clinton limestone at Niagara. Also in the same limestone at Lockport (Hall). Fig. 104 Barrandella fornicata. 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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