. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Rhyn. 900. 10 Rhynchonella sagerana, Winchell, Proc. Acad. Nat. Sci. 1862. Marshall group of Michigan. X. Rhynchonella sappho. See Stenoschisma sappho. Clay- pole's specimen (unnamed) 12,335 (000, p. 151), is doubtfully assigned to this species by G. B. Simpsoh (1889). Collected by I. C. White near Bloomsburg, Columbia Co., Pa., from ^' Gats- kilV strata in Rupert's Narrows. IX, Rhynchonella sordida. {Atrypa sordida^ Hall, Pal. N. Y. Vol. 1,1847, Trento
. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Rhyn. 900. 10 Rhynchonella sagerana, Winchell, Proc. Acad. Nat. Sci. 1862. Marshall group of Michigan. X. Rhynchonella sappho. See Stenoschisma sappho. Clay- pole's specimen (unnamed) 12,335 (000, p. 151), is doubtfully assigned to this species by G. B. Simpsoh (1889). Collected by I. C. White near Bloomsburg, Columbia Co., Pa., from ^' Gats- kilV strata in Rupert's Narrows. IX, Rhynchonella sordida. {Atrypa sordida^ Hall, Pal. N. Y. Vol. 1,1847, Trenton,) Emmons, Amer. Geol. I, ii^ 1855, 192, plate 10, fig. 16; small, circular, convex; undivided ribs roughened by cross lines; no middle fold. Supposed to be a young shell. Emmons. Tren- ton formation. II c. Rhyn, stephani. See Stenoschisma stephani. VIII g, Rhynchonella striata, new species^ Simpson, Trans. Amer, Phil. Soc. Philada., 1889, page 444, fig. 10, based on specimens 9506, 9507^ 9508, of Randall's collections at War- ren, wrongly labelled R. missouriensis. Only the ventral valves of this species have been observed, but they differ so much from known forms that it is nec- essary to consider them as belonging to a new species. Shell subtriangular ovate, apex pointed; length and width about eqi^al. Margins from the apex to below the middle nearly straight, broadly rounded below, and at the base produced in a broad extension. Ventral valve convex at the sides, de- pressed at the middle. Mesial sinus beginning near the apex and continuing to the base, becoming very broad as it ap- proaches the front. Surface marked by thirteen plications, of which five occupy the mesial sinus, the three central ones being larger than the outer ones, but all smaller than those on the other portions of the shell; plications subangular or angular. There are also very fine radiating strias on the plications, three in the space of 1 mm. The plications are crossed by fine concentric striae, whi
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