. Annual report of the Regents. New York State Museum; Science. i88 NEW YORK STATE MUSEUM Pal N. F. V. 8, Genus rhipidomella Oehlert [Ety.: p~L7zi<$, fan] (1891. Journal de conchyliologie., p. ^y2; 1892. pt I, p. 209) Shell almost circular in outline; both valves gently convex; hinge area short; slight median depression in each valve. Surface cov- ered with fine, rounded, hollow, tubular striae, which frequently open on the surface. On the interior of the pedicle valve are two strong diverging teeth. Muscular area large, and deeply impressed, con- sisting of fluted diductor impressions, inc
. Annual report of the Regents. New York State Museum; Science. i88 NEW YORK STATE MUSEUM Pal N. F. V. 8, Genus rhipidomella Oehlert [Ety.: p~L7zi<$, fan] (1891. Journal de conchyliologie., p. ^y2; 1892. pt I, 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 - 1852. Pal. N. Y. 2:2^3, 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). Or this circulus Hall (1852. Pal. N. Y. 2:56, pi. 20) b r i d a Sowerby ( 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 New York State Museum; University of the State of New York. Board of Regents. Albany : J. B. Lyon, State Printer
Size: 1801px × 1388px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorne, bookcentury1800, bookdecade1880, booksubjectscience
