. Annual report of the Regents. New York State Museum; Science. Fig. 121 Hyattella congests Fig. 131a Hyattella congesta Found in the lower Clinton limestone at Niagara. Also at Lock- port (Hall). Genus anoplotheca Sandberger [Ety.: avo-Xo^, unarmed; O-^xr/, sheath] (1853. Sit^b. d. K. K. Akad. d. IVisscns. math, naturw. Classe, 16, p. 5, 18, 102; 1894. Hall & Clarke. Pal. N. Y. v. 8, pt 2, p. 129) Concavo-convex, small shells with few plications crossed by fine often imbricating growth lines. Brachial valve with a high median septum. Brachidium a pair of spiral cones, as in W h i t - f i
. Annual report of the Regents. New York State Museum; Science. Fig. 121 Hyattella congests Fig. 131a Hyattella congesta Found in the lower Clinton limestone at Niagara. Also at Lock- port (Hall). Genus anoplotheca Sandberger [Ety.: avo-Xo^, unarmed; O-^xr/, sheath] (1853. Sit^b. d. K. K. Akad. d. IVisscns. math, naturw. Classe, 16, p. 5, 18, 102; 1894. Hall & Clarke. Pal. N. Y. v. 8, pt 2, p. 129) Concavo-convex, small shells with few plications crossed by fine often imbricating growth lines. Brachial valve with a high median septum. Brachidium a pair of spiral cones, as in W h i t - f i e 1 d e 11 a . Anoplotheca hemispherica (Sowerby) (Fig. 132). Atrypa hemispherica Hall (1852. Pal. N. Y. , pi. 23) Distinguishing characters. Hemispheric to semiorbicular form; nearly flat brachial valve, convex pedicle valve; extended, nearly straig^ht hing-e line; eight to 12 Fig. 132 Anoplotheca hemispherica .^ te te > fe With striae enlarged rouudcd to subaugular, simple plications; strong, undulating concentric striae. Found poorly preserved in the Clinton shale at Niagara. Anoplotheca plicatula (Hall) (Fig. 133). Atrypa plicatula Hall (1852. Pal. N. Y. 2:74, pi. 23) Distinguishing characters. Slightly wider than long or sub-. 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
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