. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 188 NEW YORK STATE MUSEUM Genus rhipidomella Oehlert [Ety.: finis, fan] (1891. Journal de conchyliologic, p. 372; 1892. Pal. N. Y. v. 8^ pt 1, p. 209) Shell almost circular in outline; both valves gently convex; hinge- area short; slight median depression in each valve. Surface cov- ered with fine, rounded, hollow, tubular striae, which frequently open on the surface. On the interior of the pedicle valve are two strong diverging teeth. Muscular area large, and deeply impressed, con- sisting of fluted diductor impr
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 188 NEW YORK STATE MUSEUM Genus rhipidomella Oehlert [Ety.: finis, fan] (1891. Journal de conchyliologic, p. 372; 1892. Pal. N. Y. v. 8^ pt 1, p. 209) Shell almost circular in outline; both valves gently convex; hinge- area short; slight median depression in each valve. Surface cov- ered with fine, rounded, hollow, tubular striae, which frequently open on the surface. On the interior of the pedicle valve are two strong diverging teeth. Muscular area large, and deeply impressed, con- sisting of fluted diductor impressions, inclosing small central ad- ductors. The pedicle scar fills the cavity of the beak. The interior of the brachial valve shows deep and narrow dental sockets, with prominent projecting crural plates. In the center is a strong car- dinal process, below which is the indistinct small muscular area. Rhipidomella hybrida (Sowerby) (Fig. 98). O r t h i s h y - brida Sowerby (Hall. 1852. Pal. N. Y. 2:253, pi. 52) Distinguishing characters. Wider than long; nearly equal valves; pedi- cle valve with broad, undefined de- pression down the center; brachial valve uniformly convex, sometimes- slightly depressed near front; beaks nearly equally elevated and scarcely incurved; short hinge area; fine bi- furcating striae. Found in the upper part of the lower Rochester shales and in the Bryozoa bed as well as rarely in the upper shales. Niagara sec- tions. Also at Lockport and elsewhere (Hall). Rhipidomella circulus Hall (Fig. 99). O r t h i s circulus Hall (1852. Pal. N. Y. 2:56, pi. 20). Fig. 98 Rhipidomella hybrida. 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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